an instrument for measuring and recording time, esp. by mechanical means, usually with hands or changing numbers to indicate the hour and minute

not designed to be worn or carried about.

time clock.

a meter or other device, as a speedometer or taximeter, for measuring and recording speed, distance covered, or other quantitative functioning.

biological clock.

( initial capital letter ) Astronomy . the constellation Horologium.

Computers . the circuit in a digital computer that provides a common reference train of electronic pulses for all other circuits.

to time, test, or determine by means of a clock or watch

The racehorse was clocked at two minutes thirty seconds.

Slang . to strike sharply or heavily

Somebody clocked him on the face.

clock in, to begin work, esp. by punching a time clock

She clocked in at 9 on the dot.

clock out, to end work, esp. by punching a time clock

He clocked out early yesterday.

around the clock

during all 24 hours; ceaselessly.

without stopping for rest; tirelessly

working around the clock to stem the epidemic.

clean (someone's) clock

to defeat; vanquish.

kill the clock, Sports . to use up as much game time as possible when one is winning, as to protect a lead in basketball, ice hockey, or football. Also

run out the clock.

stop the clock, to postpone an official or legal deadline by ceasing to count the hours that elapse

as when a new union contract must be agreed upon before an old contract runs out.

noun

alarm , big ben , chroniker , chronograph , chronometer , digital watch , hourglass , pendulum , stopwatch , sundial , tattler , ticker , tick-tock , timekeeper , timemarker , timepiece , timer , turnip * , watch , attain , beetle , cuckoo , digital , grandfather , hit , horologe , horometer: clepsydra , indicator , isochronon , meter , odometer , ornament , punch , realize , recorder , scarab , scarabee , speedometer , time , wallop