heat up

Từ điển Oxford Advanced Learner 8th

ˌheat ˈup derived
1. to become hot or warm
Syn: ↑warm up
• The oven takes a while to heat up.
2. (especially NAmE) (BrE also ˌhot ˈup)to become more exciting or to show an increase in activity
• The election contest is heating up.
Main entry: ↑heat_derived