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English definition of “clock”

clock

noun [C]  /klɑk/ us  
a device for measuring and showing time, often placed on a surface or attached to a wall: an alarm clock The clock is about ten minutes fast/slow (= it shows a later/earlier time than it should). Cleveland tied the game with five seconds on the clock (= still available).

clock

verb [T]  /klɑk/ us  
to use an amount of time, esp. as measured by a clock: She clocked the fastest time in practice runs for the women’s downhill skiing event.
(Definition of clock from the Cambridge Academic Content Dictionary © Cambridge University Press)
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