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Wiktionary
heat up

vb. To heat, to cause to become hotter.

WordNet
heat up
  1. v. gain heat or get hot; "The room heated up quickly" [syn: heat, hot up] [ant: cool]

  2. make hot or hotter; "heat the soup" [syn: heat] [ant: cool]

  3. make more intense; "Emotions were screwed up" [syn: hot up, screw up]

Wikipedia
Heat Up

Heat Up may refer to:

  • "Heat Up", single by Roll Deep from In at the Deep End 2005, released on Shake a Leg
  • Heat Up (Ken Hirai song)
  • SD Heat Up!! game from Slam Dunk (manga)

Usage examples of "heat up".

When they're set down on the counter tops, the platters achieve subcritical mass and begin to heat up!

The frozen slugs of xenon propellant began to heat up, and then to sublime.

Unshield a chunk of radioactive material, heat up the surrounding liquid, a heat exchanger here, secondary liquid to turn this electric generator, motors in each wheel, ugly and crude but practical.