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back
noun
the
part
of
your
body
from
your
neck
to
your
waist
on
the
opposite
side
to
your
chest
•
After
carrying
the
heavy
box
,
Maria
rubbed
her
sore
back
.
After
carrying
the
heavy
box
,
Maria
rubbed
her
sore
back
.
•
The
toddler
climbed
onto
his
father's
shoulders
and
patted
his
father's
back
.
The
toddler
climbed
onto
his
father's
shoulders
and
patted
his
father's
back
.
noun
the
part
of
your
body
from
the
shoulders
to
the
hips
,
opposite
the
chest
•
Maria
adjusted
the
heavy
backpack
that
was
rubbing
against
her
back
.
Maria
adjusted
the
heavy
backpack
that
was
rubbing
against
her
back
.
•
He
lay
on
his
back
in
the
grass
,
watching
the
clouds
drift
by
.
He
lay
on
his
back
in
the
grass
,
watching
the
clouds
drift
by
.
Old
English
"
bæc
",
of
Germanic
origin
,
related
to
Dutch
"
rug
"
and
German
"
Rücken
".
noun
-
back
,
backing
,
backs
,
backed
the
part
of
a
person
’
s
or
animal
’
s
body
between
the
neck
and
the
waist
,
on
the
side
opposite
the
chest
•
After
sitting
all
day
,
my
back
felt
stiff
.
After
sitting
all
day
,
my
back
felt
stiff
.
•
He
carried
a
heavy
backpack
on
his
back
during
the
mountain
hike
.
He
carried
a
heavy
backpack
on
his
back
during
the
mountain
hike
.
Old
English
‘
bæc
’,
related
to
German
‘
Rücken
’,
meaning
the
rear
of
the
body
.
adverb
-
back
,
backing
,
backs
,
backed
to
or
toward
the
place
,
position
,
or
state
that
someone
or
something
was
in
before
•
Please
put
the
book
back
on
the
shelf
.
Please
put
the
book
back
on
the
shelf
.
•
After
vacation
,
he
went
back
to
work
on
Monday
morning
.
After
vacation
,
he
went
back
to
work
on
Monday
morning
.
noun
the
side
or
part
of
something
that
is
opposite
the
front
•
Write
your
name
on
the
back
of
the
photo
.
Write
your
name
on
the
back
of
the
photo
.
•
There
is
a
map
printed
on
the
back
of
the
brochure
.
There
is
a
map
printed
on
the
back
of
the
brochure
.
adverb
to
the
place
,
position
,
or
condition
where
someone
or
something
was
before
•
Please
put
the
book
back
on
the
shelf
when
you
’
re
done
.
Please
put
the
book
back
on
the
shelf
when
you
’
re
done
.
•
After
a
year
abroad
,
he
came
back
to
his
hometown
.
After
a
year
abroad
,
he
came
back
to
his
hometown
.
adjective
located
at
or
toward
the
rear
of
something
•
We
sat
in
the
back
row
of
the
theater
.
We
sat
in
the
back
row
of
the
theater
.
•
The
house
has
a
back
door
that
opens
onto
the
garden
.
The
house
has
a
back
door
that
opens
onto
the
garden
.
adjective
located
at
or
toward
the
rear
of
something
•
Please
put
the
empty
crates
in
the
back
room
.
Please
put
the
empty
crates
in
the
back
room
.
•
The
train's
back
carriage
was
almost
empty
.
The
train's
back
carriage
was
almost
empty
.
adverb
to
or
toward
an
earlier
place
,
position
,
or
condition
•
I'll
be
back
in
five
minutes
.
I'll
be
back
in
five
minutes
.
•
She
stepped
back
to
admire
the
finished
painting
.
She
stepped
back
to
admire
the
finished
painting
.
noun
-
back
,
backing
,
backs
,
backed
the
part
or
side
of
something
that
is
farthest
from
the
front
or
from
where
you
are
•
I
sat
at
the
back
of
the
classroom
so
I
wouldn
’
t
block
anyone
’
s
view
.
I
sat
at
the
back
of
the
classroom
so
I
wouldn
’
t
block
anyone
’
s
view
.
•
The
date
is
printed
on
the
back
of
the
photograph
.
The
date
is
printed
on
the
back
of
the
photograph
.
adjective
-
back
,
backing
,
backs
,
backed
at
or
toward
the
rear
part
of
something
•
Use
the
back
door
;
the
front
one
is
locked
.
Use
the
back
door
;
the
front
one
is
locked
.
•
We
sat
in
the
back
row
of
the
theater
.
We
sat
in
the
back
row
of
the
theater
.
noun
the
part
of
your
body
from
your
neck
to
your
waist
on
the
opposite
side
to
your
chest
•
Eloise
lay
on
her
back
and
watched
the
clouds
drift
by
.
Eloise
lay
on
her
back
and
watched
the
clouds
drift
by
.
•
Carrying
the
heavy
backpack
hurt
his
lower
back
after
a
few
hours
.
Carrying
the
heavy
backpack
hurt
his
lower
back
after
a
few
hours
.
Old
English
"
bæc
"
meaning
the
rear
surface
of
the
body
,
related
to
Old
Norse
"
bak
".
noun
the
part
of
something
that
is
farthest
from
the
front
•
The
answer
key
is
printed
at
the
back
of
the
book
.
The
answer
key
is
printed
at
the
back
of
the
book
.
•
They
planted
tomatoes
in
the
back
of
the
garden
.
They
planted
tomatoes
in
the
back
of
the
garden
.
Extension
of
body-part
sense
to
describe
the
rear
side
of
things
,
recorded
since
Middle
English
period
.
adverb
to
the
place
,
position
,
or
situation
that
existed
earlier
•
When
the
bell
rang
,
the
students
hurried
back
to
class
.
When
the
bell
rang
,
the
students
hurried
back
to
class
.
•
She
gave
the
pen
back
after
she
borrowed
it
.
She
gave
the
pen
back
after
she
borrowed
it
.
Old
English
use
of
“
bæc
”
adverbially
to
mean
“
towards
the
rear
or
home
”.
adjective
located
at
or
near
the
rear
of
something
•
Use
the
back
door
if
the
front
is
locked
.
Use
the
back
door
if
the
front
is
locked
.
•
They
live
in
a
small
house
on
a
quiet
back
street
.
They
live
in
a
small
house
on
a
quiet
back
street
.
Sense
recorded
since
the
14th
century
to
describe
parts
situated
at
the
rear
.
verb
to
support
someone
or
something
by
giving
help
,
encouragement
,
or
money
•
The
investors
agreed
to
back
the
new
tech
startup
.
The
investors
agreed
to
back
the
new
tech
startup
.
•
I
will
back
you
if
you
decide
to
run
for
class
president
.
I
will
back
you
if
you
decide
to
run
for
class
president
.
verb
to
move
or
cause
something
to
move
in
a
direction
opposite
to
forward
•
She
carefully
backed
the
car
out
of
the
driveway
.
She
carefully
backed
the
car
out
of
the
driveway
.
•
The
dog
backed
away
when
it
saw
the
snake
.
The
dog
backed
away
when
it
saw
the
snake
.
verb
to
give
help
,
approval
,
or
financial
support
to
someone
or
something
•
The
investors
backed
the
new
café
with
a
generous
loan
.
The
investors
backed
the
new
café
with
a
generous
loan
.
•
Her
parents
always
back
her
dreams
.
Her
parents
always
back
her
dreams
.
verb
to
move
or
cause
to
move
in
a
direction
opposite
to
the
usual
one
•
He
backed
the
car
out
of
the
narrow
driveway
.
He
backed
the
car
out
of
the
narrow
driveway
.
•
Could
you
back
up
a
little
so
I
can
see
the
screen
?
Could
you
back
up
a
little
so
I
can
see
the
screen
?
verb
-
back
,
backing
,
backs
,
backed
to
support
someone
or
something
by
giving
help
,
money
,
or
approval
•
Several
investors
agreed
to
back
her
new
restaurant
.
Several
investors
agreed
to
back
her
new
restaurant
.
•
I
will
back
you
if
you
decide
to
apply
for
the
scholarship
.
I
will
back
you
if
you
decide
to
apply
for
the
scholarship
.
verb
to
support
,
approve
,
or
give
money
to
someone
or
something
•
Several
investors
agreed
to
back
the
new
company
.
Several
investors
agreed
to
back
the
new
company
.
•
Her
parents
back
her
decision
to
study
abroad
.
Her
parents
back
her
decision
to
study
abroad
.
Derived
from
the
sense
of
placing
something
at
one
’
s
back
as
protection
,
later
extended
to
financial
or
moral
support
(
17th
century
).
background
noun
the
part
of
a
scene
or
picture
that
is
farthest
from
the
viewer
and
not
the
main
focus
•
Snowy
mountains
rose
in
the
background
of
the
holiday
photo
.
Snowy
mountains
rose
in
the
background
of
the
holiday
photo
.
•
A
small
boat
drifted
past
while
the
city
skyline
shimmered
in
the
background
.
A
small
boat
drifted
past
while
the
city
skyline
shimmered
in
the
background
.
noun
quiet
sound
,
music
,
or
noise
that
is
present
but
not
the
main
focus
•
Soft
jazz
played
in
the
background
while
we
ate
dinner
.
Soft
jazz
played
in
the
background
while
we
ate
dinner
.
•
He
likes
to
keep
the
TV
on
in
the
background
when
he
studies
.
He
likes
to
keep
the
TV
on
in
the
background
when
he
studies
.
noun
a
person
’
s
past
experiences
,
education
,
or
family
that
shapes
who
they
are
•
Despite
her
poor
background
,
Maria
became
a
successful
engineer
.
Despite
her
poor
background
,
Maria
became
a
successful
engineer
.
•
We
want
candidates
with
a
strong
science
background
.
We
want
candidates
with
a
strong
science
background
.
noun
the
general
situation
or
conditions
in
which
something
happens
and
that
helps
explain
it
•
The
speech
came
against
a
background
of
rising
unemployment
.
The
speech
came
against
a
background
of
rising
unemployment
.
•
To
understand
the
conflict
,
you
need
some
historical
background
.
To
understand
the
conflict
,
you
need
some
historical
background
.
noun
computer
programs
or
processes
that
keep
running
while
you
work
on
something
else
and
do
not
appear
on
the
main
screen
•
The
antivirus
program
runs
in
the
background
so
you
never
notice
it
.
The
antivirus
program
runs
in
the
background
so
you
never
notice
it
.
•
Too
many
background
apps
can
drain
your
phone
battery
.
Too
many
background
apps
can
drain
your
phone
battery
.
quarterback
noun
the
player
on
an
American
or
Canadian
football
team
who
leads
the
offense
,
calls
the
plays
,
and
usually
throws
the
ball
•
The
quarterback
threw
a
perfect
pass
with
only
seconds
left
on
the
clock
.
The
quarterback
threw
a
perfect
pass
with
only
seconds
left
on
the
clock
.
•
Each
quarterback
wears
a
special
headset
inside
his
helmet
to
hear
the
coach's
instructions
.
Each
quarterback
wears
a
special
headset
inside
his
helmet
to
hear
the
coach's
instructions
.
Formed
from
quarter
(
one
of
four
)
+
back
(
a
player
positioned
behind
the
line
);
first
used
in
rugby-style
football
in
the
late
19th
century
.
verb
to
act
as
the
quarterback
for
a
football
team
,
directing
plays
and
leading
the
offense
•
Mariana
will
quarterback
for
the
school
team
this
season
.
Mariana
will
quarterback
for
the
school
team
this
season
.
•
He
quarterbacked
the
squad
to
three
championships
in
a
row
.
He
quarterbacked
the
squad
to
three
championships
in
a
row
.
verb
to
lead
,
organize
,
or
direct
a
project
or
activity
,
like
a
quarterback
guiding
a
team
•
Anna
was
chosen
to
quarterback
the
new
marketing
campaign
.
Anna
was
chosen
to
quarterback
the
new
marketing
campaign
.
•
The
senior
engineer
quarterbacked
the
project
from
concept
to
launch
.
The
senior
engineer
quarterbacked
the
project
from
concept
to
launch
.
feedback
noun
-
feedback
opinions
or
comments
that
tell
someone
how
well
they
are
doing
and
how
they
can
improve
•
After
the
presentation
,
the
teacher
gave
Julia
helpful
feedback
on
her
speech
.
After
the
presentation
,
the
teacher
gave
Julia
helpful
feedback
on
her
speech
.
•
The
app
asks
users
to
send
feedback
so
the
developers
can
fix
problems
.
The
app
asks
users
to
send
feedback
so
the
developers
can
fix
problems
.
formed
from
the
words
feed
+
back
(
1940s
)
to
describe
returning
part
of
a
system
’
s
output
to
its
input
,
later
broadened
to
general
response
noun
-
feedback
a
loud
,
squealing
noise
that
happens
when
a
microphone
picks
up
sound
from
its
own
speaker
and
re-amplifies
it
•
When
the
guitarist
stood
too
close
to
the
amplifier
,
piercing
feedback
filled
the
hall
.
When
the
guitarist
stood
too
close
to
the
amplifier
,
piercing
feedback
filled
the
hall
.
•
The
sound
engineer
quickly
lowered
the
volume
to
stop
the
shrieking
feedback
.
The
sound
engineer
quickly
lowered
the
volume
to
stop
the
shrieking
feedback
.
borrowed
from
electronics
use
of
feedback
loops
;
the
unwanted
sound
is
caused
by
the
signal
feeding
back
into
the
system
noun
-
feedback
the
return
of
part
of
a
system
’
s
output
to
its
input
,
used
to
control
or
change
how
the
system
works
•
In
a
thermostat
,
temperature
feedback
keeps
the
room
comfortable
.
In
a
thermostat
,
temperature
feedback
keeps
the
room
comfortable
.
•
Scientists
study
climate
feedback
to
predict
future
warming
.
Scientists
study
climate
feedback
to
predict
future
warming
.
first
used
in
1920s
engineering
to
describe
control
loops
,
later
applied
in
many
sciences
verb
to
give
comments
or
information
back
to
someone
or
to
a
system
•
Please
feedback
your
thoughts
to
the
team
by
Friday
.
Please
feedback
your
thoughts
to
the
team
by
Friday
.
•
The
manager
asked
staff
to
feedback
any
safety
concerns
.
The
manager
asked
staff
to
feedback
any
safety
concerns
.
verb
use
developed
later
than
noun
,
turning
the
noun
into
an
action
meaning
“
to
give
feedback
”