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English definition of “warm up”

warm up

verb [I or T] uk phrasal verb with warm   /wɔːm/ us    /wɔːrm/

(EVENT)

informal If an event warms up, it starts to become more interesting, enjoyable, or exciting: The party was only just starting to warm up as I left.

(EXERCISE)

to prepare yourself for a physical activity by doing some gentle exercises and stretches: If you don't warm up before taking exercise, you risk injuring yourself.
(Definition of warm up phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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