knuckle under to someone/something
knuckle under to (someone or something)
To yield or submit to the pressure or influence of someone or something. I knew I had to just knuckle under to the committee's requests if I wanted my proposal to be approved. Tom said he would never knuckle under to our father and stormed out of the house, never to return.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
knuckle under (to someone/something)
in. to give in to or accept someone or something. She always refused to knuckle under to anyone.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.