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


body clock

BrE BrE//ˈbɒdi klɒk//
; NAmE NAmE//ˈbɑːdi klɑːk//
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the natural tendency that your body has to 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 the Oxford Advanced American Dictionary entry: body clock