American English

Definition of heat up phrasal verb from the Oxford Advanced American Dictionary

 

heat up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to become hot or warm synonym warm up The oven takes a while to heat up.
  2. 2 to become more exciting or to show an increase in activity The election contest is heating up.

heat somethingup

 
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to make something hot or warm synonym warm up Just heat up the food in the microwave.
See the Oxford Advanced Learner's Dictionary entry: heat up