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clock

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noun [countable] American English pronunciation: clock /klɑk/ 
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singularclock
pluralclocks
  1. an object that shows the time. The object like a clock that you wear on your wrist is called a watch. Clocks either have a background called a face with hands that point to the hours and minutes, or they are digital clocks that show the time as a set of numbers. You say a clock is slow when it shows a time that is earlier than the correct time. You say it is fast when it shows a time that is later than the correct time

    The only sound was the clock ticking.

    the kitchen/church/bedside clock:

    I glanced at the kitchen clock.

    the clock strikes one/five/eleven (o'clock):

    The church clock struck 10 o'clock.

    set/adjust a clock (=change it to show the correct time):

    We need to set all the clocks back one hour.

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