noun
EXAMPLES FROM CORPUS
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It's the men now, as often as not, who hear the biological clock ticking loudest.
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Of course, nature being unjust as ever, I have no biological clock of my own.
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The ticking of the biological clock .
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The way Max's biological clock is ticking, it's a wonder Emma didn't call out the bomb squad.
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Unlike mechanical clocks, which are completely blind to their surroundings, a biological clock gets reset every day by the sun.