- (countable) A clock is an instrument that tells you what the time is. A small clock which you carry is called a watch.
- He was sleepy, and the clock said 11:32.
- The digital clock on the wall tells her that it is almost six-thirty.
- She'd never before been in a house which did not have a clock ticking somewhere.
- If a clock is fast, it shows a time after the real time.
- He looked at the clock and then at his watch: The clock was nine minutes fast. He still had some time.
- If a clock is slow, it shows a time before the real time.
- If something goes around the clock, it goes for 24 hours without stop.
- His family stayed at Scott's bedside around the clock.
- The museum is open around the clock from May 26 at 12:01 a.m. through May 28 at 11:59 p.m.
- (transitive) If you clock something, you measure how long it takes or how fast it moves.
- The police clocked the car at 137 km/h.
- The drive took twenty-two minutes; he clocked it.
- (transitive) If something clocks a time or a speed, it takes that long or moves that fast.
- The trip clocks in at about 12 hours.
- He clocked 9.12 seconds, a new world record.
- (intransitive) If you clock in or out at work, school, etc., you record the time they arrive or leave.
- He clocked in at four a.m. for a twelve-hour shift.
- (intransitive) If you clock up a number of things, you reach that total after some time.
- Because I drive one hour to work, I'm clocking up a lot of miles.
- (transitive) If you clock someone, you hit them hard in the head.
- He might take some time to wake up. He got clocked pretty good.