knuckle under

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

ceder, submeter-se, curvar-se

to yield or submit to pressure or authority

:
After weeks of resistance, he finally had to knuckle under to their demands.
Após semanas de resistência, ele finalmente teve que ceder às suas exigências.
The company refused to knuckle under to the union's threats.
A empresa se recusou a ceder às ameaças do sindicato.