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1. To become warmer in temperature. In this usage, a noun or pronoun can be used between "heat" and "up." You can put your coat away because the weatherman says it's going to heat up this week. I'm just waiting for the water to heat up before I get in the shower.
2. To cause something to become warmer in temperature. In this usage, a noun or pronoun can be used between "heat" and "up." I'll heat up my lunch when you're done with the microwave.
3. To make one angry. In this usage, a noun or pronoun can be used between "heat" and "up." Please calm down, I didn't mean to heat you up. This whole situation heats me up so much—it's amazing that I haven't screamed at the whole staff today.
4. To intensify. The competition will heat up as we get closer to the playoffs.
heat someone up
Fig. to make someone angry. (One old [now folksy] past tense is het.) This kind of nonsense really heats me up. Mean talk heats up the kids.
heat something up (to something)
to raise the temperature of something to a certain level. Please heat this room up to about seventy degrees. Can you heat up the room a little more?
1. Lit. to get warmer or hot. It really heats up in the afternoon around here. How soon will dinner be heated up?
2. Fig. to grow more animated or combative. The debate began to heat up near the end. Their argument was heating up, and I was afraid there would be fighting.
Become acute or intense, as in If inflation heats up, the interest rate will surely rise, or The debate over the budget was heating up. [Early 1200s]
1. To become hotter: As stars heat up, they expend more energy.
2. To cause something to become hotter: He heated the water up on the stove. She heated up the pizza in the microwave.
3. To become acute or intense: The baseball game heated up in the last inning.
4. Slang To make someone angry: That incompetent umpire really heated me up. The newscaster's outlandish comments heated up the audience.