hot under the collar
US /hɑt ˈʌndər ðə ˈkɑlər/
UK /hɑt ˈʌndər ðə ˈkɑlər/

1.
生氣, 惱火, 尷尬
angry, annoyed, or embarrassed
:
•
He got all hot under the collar when I mentioned his mistake.
當我提到他的錯誤時,他變得非常生氣。
•
Don't get hot under the collar about such a small thing.
不要為這麼小的事情生氣。