heat up
US /hiːt ˈʌp/
UK /hiːt ˈʌp/

1.
2.
激しくなる, 白熱する
to become more intense or exciting
:
•
The debate started to heat up as both sides presented their arguments.
両者が議論を提示するにつれて、議論は白熱し始めた。
•
The competition is really starting to heat up.
競争が本当に激しくなってきた。