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heat up is a verb meaning "gain heat or get hot". It carries 3 recorded senses.
gain heat or get hot
“The room heated up quickly”
make hot or hotter
“the sun heats the oceans”
“heat the water on the stove”
Definitions, synonyms and semantic relations for heat up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.