To heat something after it has cooled off, especially previously cooked food(verb)
To revive; to cheer; to cherish.(verb)
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Use "reheat" in a sentence
"I prefer using the toaster and a "reheat" setting to warm and soften the pastry."
"Bigger restaurants in the big cities might not be as good as the tiny places, but even then the food tends to be better than reheat, assemble, and serve chain restaurants like Applebees."
"To reheat them, warm at 200 to 250°F in the oven or grill."