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warm up

(EVENT) informal phrasal verb with warm
 
/wɔːm/
 
US  /wɔːrm/ verb [I or T]

Definition

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.Becoming betterMaking things betterMaking progress and advancing
(Definition of warm up (EVENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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