knuckle under to (someone or something)

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knuckle under to (someone or something)

To yield or submit to 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.
See also: knuckle

knuckle under (to someone/something)

in. to give in to or accept someone or something. She always refused to knuckle under to anyone.