biological clocknoun [ C ]uk /baɪ.əˌlɒdʒ.ɪ.kəl ˈklɒk/ us /baɪ.əˌlɑː.dʒɪ.kəl ˈklɑːk/
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(Definition of “biological clock” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a special place in the road in the UK, with a set of lights at the opposite side of the road and a device that people can press to make the red light show and the traffic stop, allowing them to cross