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Definition of body clock noun from the Oxford Advanced Learner's Dictionary

body clock

noun
 
/ˈbɒdi klɒk/
 
/ˈbɑːdi klɑːk/
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  1. a natural system that makes your body need sleep, food, etc. at particular times of the day
    • I only arrived in London yesterday, and my body clock is still on New York time.
See body clock in the Oxford Advanced American Dictionary
Check pronunciation: body clock

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