Longman Dictionary of Contemporary English homepage

hot

2 verb
     
hot2 past tense and past participle hotted, present participle hotting

hot up

phrasal verb
1 if something hots up, there is more activity or excitement:
Things generally hot up a few days before the race.
2

the pace hots up

used to say that the speed of something increases
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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