heat up

phrasal verb
heated up; heating up; heats up

Definition of heat up

1 : to become warm or hot The morning started out cold but it heated up quickly.
2 : to become more active, intense, or angry Their conversation started to heat up. Competition between the two companies is heating up.
3 heat (something) up or heat up (something) : to cause (something) to become warm or hot Could you heat up the vegetables, please?

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