knuckle under

US /ˈnʌk.l̩ ˌʌn.dər/

UK /ˈnʌk.l̩ ˌʌn.dər/

1.

to yield or submit to pressure or authority

:

•

After weeks of resistance, he finally had to knuckle under to their demands.

•

The company refused to knuckle under to the union's threats.

:

yield submit give in capitulate bow succumb concede acquiesce defer bend

:

knuckle knuckle down near the knuckle knuckle sandwich under rap somebody on the knuckles bubble under