Definition of 'hot up'

Verb

1. gain heat or get hot; "The room heated up quickly"
      Synonyms: heat heat up
      Antonyms: cool chill cool down
2. make more intense; "Emotions were screwed up"
      Synonyms: heat up screw up
3. make more powerful; "he souped up the old cars"
      Synonyms: soup up hop up

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