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English definition of “heat up something”

heat up something

verb [T] phrasal verb with heat  /hit/ us  
to make something warm or hot: Let's see what happens when I heat it up. If a situation heats up, it becomes more extreme: With the political climate heating up, we can expect to hear a lot more from both candidates.
(Definition of heat up something from the Cambridge Academic Content Dictionary © Cambridge University Press)
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