knuckle under

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

someterse, ceder, doblegarse

to yield or submit to pressure or authority

:
After weeks of resistance, he finally had to knuckle under to their demands.
Después de semanas de resistencia, finalmente tuvo que someterse a sus demandas.
The company refused to knuckle under to the union's threats.
La empresa se negó a someterse a las amenazas del sindicato.