Meaning of “warm up” in the English Dictionary

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"warm up" in British English

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warm-upnoun [ C ]

uk /ˈwɔːm.ʌp/ us /ˈwɔːrm.ʌp/

something that you do to prepare yourself for an activity, especially gentle exercises before a physical activity:

A warm-up is important before a run so you don't strain any muscles.
Let's do a few warm-up exercises.

(Definition of “warm up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)