Tra từ biological clock - Từ điển Oxford Advanced Learner 8th

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biological clock
middle age
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Từ điển Oxford Advanced Learner 8th

biological clock

ˌbioˌlogical ˈclock [biological clock] BrE NAmE noun (technical)
a natural system in living things that controls regular physical activities such as sleeping: (figurative)At 35, Kate's biological clock was ticking (= she was beginning to think that she would soon be too old to have children).
•The movements of the leaves are triggered by the plant's biological clock.