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expression
noun
a
word
or
group
of
words
that
has
a
particular
meaning
•
I
didn't
understand
the
expression
'{{{
class='hover
:
underline
'
href='/dictionary/search/hit
the
hit'>sack'>hit
the
sack
}}}'
until
I
looked
it
up
.
I
didn't
understand
the
expression
'{{{
class='hover
:
underline
'
href='/dictionary/search/hit
the
hit'>sack'>hit
the
sack
}}}'
until
I
looked
it
up
.
•
Please
avoid
slang
expressions
in
your
essay
.
Please
avoid
slang
expressions
in
your
essay
.
noun
the
act
of
showing
what
you
think
or
feel
through
words
,
art
,
or
actions
•
Painting
is
his
favorite
form
of
self-expression
.
Painting
is
his
favorite
form
of
self-expression
.
•
Her
smile
was
an
expression
of
gratitude
.
Her
smile
was
an
expression
of
gratitude
.
noun
the
look
on
someone
’
s
face
that
shows
what
they
are
thinking
or
feeling
•
Her
puzzled
expression
made
me
laugh
.
Her
puzzled
expression
made
me
laugh
.
•
With
a
stern
expression
,
the
coach
called
the
team
together
.
With
a
stern
expression
,
the
coach
called
the
team
together
.
noun
a
combination
of
numbers
,
symbols
,
or
words
that
represents
a
value
or
calculation
in
mathematics
or
computing
•
Solve
the
algebraic
expression
2x
+
5
.
Solve
the
algebraic
expression
2x
+
5
.
•
In
JavaScript
,
an
expression
can
return
a
value
.
In
JavaScript
,
an
expression
can
return
a
value
.
noun
the
process
by
which
information
from
a
gene
is
used
to
create
a
protein
or
trait
in
a
living
organism
•
Scientists
studied
gene expression
in
cancer
cells
.
Scientists
studied
gene expression
in
cancer
cells
.
•
Proper
nutrition
can
affect
the
expression
of
certain
genes
.
Proper
nutrition
can
affect
the
expression
of
certain
genes
.
noun
the
act
of
squeezing
or
pressing
something
to
force
out
liquid
such
as
juice
or
oil
•
The
chef
used
a
press
for
the
expression
of
lemon
juice
.
The
chef
used
a
press
for
the
expression
of
lemon
juice
.
•
Olive
expression
produces
high-quality
oil
.
Olive
expression
produces
high-quality
oil
.
depression
noun
a
strong
feeling
of
sadness
and
lack
of
hope
,
especially
for
a
period
of
time
•
A
wave
of
depression
washed
over
her
when
she
heard
the
bad
news
.
A
wave
of
depression
washed
over
her
when
she
heard
the
bad
news
.
•
The
gray
,
rainy
weather
filled
everyone
with
depression
.
The
gray
,
rainy
weather
filled
everyone
with
depression
.
noun
a
serious
medical
condition
in
which
a
person
feels
very
sad
,
hopeless
,
tired
,
and
loses
interest
in
life
for
a
long
time
•
After
losing
his
job
,
Mark
struggled
with
depression
and
found
it
hard
to
get
out
of
bed
.
After
losing
his
job
,
Mark
struggled
with
depression
and
found
it
hard
to
get
out
of
bed
.
•
Talking
to
a
therapist
helped
Olivia
manage
her
depression
.
Talking
to
a
therapist
helped
Olivia
manage
her
depression
.
from
Latin
deprimere
“
to
press
down
,”
meaning
“
sadness
”
since
the
17th
century
noun
a
part
of
a
surface
that
is
lower
than
the
surrounding
area
;
a
hollow
or
dent
•
There
is
a
small
depression
in
the
center
of
the
metal
lid
.
There
is
a
small
depression
in
the
center
of
the
metal
lid
.
•
The
dinosaur
’
s
footprint
left
a
deep
depression
in
the
mud
.
The
dinosaur
’
s
footprint
left
a
deep
depression
in
the
mud
.
noun
a
long
and
very
serious
period
when
business
activity
slows
down
and
many
people
do
not
have
jobs
•
The
Great
Depression
of
the
1930s
left
millions
without
jobs
.
The
Great
Depression
of
the
1930s
left
millions
without
jobs
.
•
Economists
fear
that
the
trade
war
could
lead
to
another
depression
.
Economists
fear
that
the
trade
war
could
lead
to
another
depression
.
noun
a
region
of
low
air
pressure
that
often
brings
clouds
,
wind
,
and
rain
•
A
tropical
depression
formed
off
the
coast
and
is
moving
north
.
A
tropical
depression
formed
off
the
coast
and
is
moving
north
.
•
The
weather
forecast
warns
of
a
depression
bringing
heavy
showers
tomorrow
.
The
weather
forecast
warns
of
a
depression
bringing
heavy
showers
tomorrow
.
impression
noun
the
opinion
or
feeling
you
have
about
someone
or
something
based
on
how
they
seem
•
My
first
impression
of
the
city
was
that
it
was
very
friendly
.
My
first
impression
of
the
city
was
that
it
was
very
friendly
.
•
He
wanted
to
make
a
good
impression
on
his
new
teachers
.
He
wanted
to
make
a
good
impression
on
his
new
teachers
.
noun
a
mark
,
dent
,
or
shape
left
on
a
surface
after
something
presses
against
it
•
The
dinosaur
left
a
deep
impression
in
the
soft
mud
.
The
dinosaur
left
a
deep
impression
in
the
soft
mud
.
•
She
pressed
the
key
into
the
wax
,
leaving
an
impression
for
the
seal
.
She
pressed
the
key
into
the
wax
,
leaving
an
impression
for
the
seal
.
noun
an
entertaining
imitation
of
the
way
a
famous
person
speaks
or
acts
•
Carl
made
everyone
laugh
with
his
impression
of
the
president
.
Carl
made
everyone
laugh
with
his
impression
of
the
president
.
•
She
can
do
a
perfect
impression
of
her
favorite
singer
.
She
can
do
a
perfect
impression
of
her
favorite
singer
.
noun
one
time
that
an
online
advertisement
,
web
page
,
or
social-media
post
is
displayed
to
a
user
•
The
ad
campaign
got
over
a
million
impressions
in
its
first
week
.
The
ad
campaign
got
over
a
million
impressions
in
its
first
week
.
•
Marketers
track
impressions
to
measure
visibility
online
.
Marketers
track
impressions
to
measure
visibility
online
.