Definition of "heat up" []

• To heat, to cause to become hotter. (verb)

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• "They used C-4 to heat up some C rations — it burns with a bright yellow flame; a piece the size of a walnut will heat a whole can — but nobody had much appetite, even before Moses ate half a can of Ham & Limas and barfed."
• "Instead of burning fossil fuels to heat up kilns for firing high-tech ceramics, we can mimic mother-of-pearl, which self-assembles a substance twice as strong as those ceramics in seawater: no heat required."
• "Brine was methodically wrapping the fuses of the seal bombs with thin monofilament silver wire designed to heat up when a current was applied."