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heat

2 verb
     
heat2 [transitive]
to make something become warm or hot [= warm up]:
Heat the milk until it boils.

heat up

phrasal verb
1 to become warm or hot, or to make something become warm or hot:
The stove takes a while to heat up.
heat something ↔ up
I heated up the remains of last night's supper.
2 if a situation heats up, it becomes dangerous or full of problems

heat something through

phrasal verb
DFC to heat food thoroughly

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