Definition of “warm (sb/sth) up” - English Dictionary

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“warm (sb/sth) up” in British English

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warm (sb/sth) up

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

to become warmer or to make someone or something warmer:

The house soon warms up with the heating on.
I'll just warm up the engine while you're getting your coats on.

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