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track
verb
to
follow
the
movements
or
trail
of
a
person
,
animal
,
or
object
in
order
to
find
or
observe
them
•
Rangers
tracked
the
injured
bear
through
the
mountains
.
Rangers
tracked
the
injured
bear
through
the
mountains
.
•
The
detective
used
security
cameras
to
track
the
suspect
’
s
route
.
The
detective
used
security
cameras
to
track
the
suspect
’
s
route
.
Verb
sense
comes
from
the
noun
‘
track
’,
meaning
to
follow
a
track
or
trail
(
17th
c
.).
verb
to
record
or
watch
the
progress
,
movement
,
or
development
of
something
over
time
•
The
app
tracks
how
many
steps
you
take
each
day
.
The
app
tracks
how
many
steps
you
take
each
day
.
•
Teachers
track
students
’
progress
with
weekly
tests
.
Teachers
track
students
’
progress
with
weekly
tests
.
Extended
figurative
use
from
the
idea
of
‘
keeping
on
the
track
of
’
something
,
20th
c
.
verb
to
leave
dirty
marks
or
mud
on
a
surface
after
walking
through
it
•
The
kids
tracked
mud
all
over
the
clean
floor
.
The
kids
tracked
mud
all
over
the
clean
floor
.
•
Please
wipe
your
shoes
;
don
’
t
track
snow
into
the
house
.
Please
wipe
your
shoes
;
don
’
t
track
snow
into
the
house
.
From
earlier
sense
‘
leave
a
track
’,
attested
mid-19th
c
.
crack
verb
-
crack
,
cracking
,
cracks
,
cracked
to
break
or
cause
something
to
break
with
a
sudden
sound
,
often
forming
lines
or
pieces
•
He
cracked
the
egg
into
the
bowl
.
He
cracked
the
egg
into
the
bowl
.
•
The
ice
cracked
beneath
our
feet
.
The
ice
cracked
beneath
our
feet
.
verb
-
crack
,
cracking
,
cracks
,
cracked
to
find
the
answer
to
something
difficult
,
such
as
a
problem
,
code
,
or
mystery
•
Scientists
finally
cracked
the
genetic
code
.
Scientists
finally
cracked
the
genetic
code
.
•
Can
you
crack
the
password
for
me
?
Can
you
crack
the
password
for
me
?
verb
-
crack
,
cracking
,
cracks
,
cracked
to
lose
self-control
or
become
unable
to
cope
under
pressure
or
stress
•
After
days
without
sleep
,
he
cracked
during
the
interrogation
.
After
days
without
sleep
,
he
cracked
during
the
interrogation
.
•
She
tried
to
stay
calm
,
but
eventually
cracked
and
began
to
cry
.
She
tried
to
stay
calm
,
but
eventually
cracked
and
began
to
cry
.
rack
verb
to
cause
someone
great
physical
pain
or
deep
mental
distress
•
A
bad
cough
racked
his
chest
all
night
.
A
bad
cough
racked
his
chest
all
night
.
•
Guilt
racked
her
mind
after
the
accident
.
Guilt
racked
her
mind
after
the
accident
.
Derived
from
the
noun
sense
of
stretching
on
the
rack
,
later
extended
figuratively
to
intense
pain
or
worry
.
verb
to
arrange
billiard
,
pool
,
or
snooker
balls
into
the
proper
formation
at
the
start
of
a
game
•
He
carefully
racked
the
balls
before
the
first
break
.
He
carefully
racked
the
balls
before
the
first
break
.
•
"
Your
turn
to
rack
,"
she
said
,
handing
him
the
wooden
frame
.
"
Your
turn
to
rack
,"
she
said
,
handing
him
the
wooden
frame
.
From
the
noun
"
rack
"
for
the
triangular
frame
used
in
cue
sports
,
extended
to
the
action
of
placing
the
balls
.