Definition of heat up phrasal verb from the Oxford Advanced Learner's Dictionary

Phrasal Verbs
  1. 1  to become hot or warm synonym warm The oven takes a while to heat up. See related entries: Preparing food
  2. 2  (especially North American English) (British English also hot up) to become more exciting or to show an increase in activity The election contest is heating up.
 to make something hot or warm synonym warm Just heat up the food in the microwave. See related entries: Ways of cooking
See the Oxford Advanced American Dictionary entry: heat up

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