knuckle under

US /ˈnʌk.l̩ ˌʌn.dər/
UK /ˈnʌk.l̩ ˌʌn.dər/
"knuckle under" picture
1.

屈服, 让步, 顺从

to yield or submit to pressure or authority

:
After weeks of resistance, he finally had to knuckle under to their demands.
经过数周的抵抗,他最终不得不屈服于他们的要求。
The company refused to knuckle under to the union's threats.
公司拒绝屈服于工会的威胁。