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Verb: heat up
  1. Gain heat or get hot
    "The room heated up quickly";
    - heat, hot up [Brit]
     
  2. Make hot or hotter
    "the sun heats up the oceans";
    - heat
     
  3. Make more intense
    "Emotions were heated up";
    - hot up [Brit], screw up

Derived forms: heats up, heating up, heated up

Type of: alter, change, change state, compound, deepen, heighten, intensify, modify, turn