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English definition of “sb's biological clock is ticking (away)”

sb's biological clock is ticking (away)

When a woman says her biological clock is ticking (away), she means that she is worried that she is getting too old to have a baby.Processes and stages connected with sexual reproduction
(Definition of sb's biological clock is ticking (away) from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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