What is "hot up"

vb. 1 To heat up: 2 # (context British English) To increase in temperature. 3 # (context idiomatic English) To become more heated. 4 # To make or become more sexually appealing, enticing or exciting.(attention en based on the citations it would seem that this definition may need to be tweaked)

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

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

3. make more powerful; "he souped up the old cars" [syn: soup up, hop up]