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English definition of “hot up”

hot up

UK informal
verb uk phrasal verb with hot   /hɒt/ us    /hɑːt/ (-tt-)
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.
(Definition of hot up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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