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hot up

UK informal phrasal verb with hot
 
/hɒt/
 
US  /hɑːt/ verb (-tt-)

Definition

If an event or situation hots up, it becomes more exciting and more things start to happen: A few days before the elections, the pace began to hot up. The competition is really hotting up now.Increasing and intensifying
(Definition of hot up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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