knuckle under vs defer

knuckle under and defer both are verbs.

Word	Noun	Adjective	Verb	Adverb
knuckle under	No	No	Yes	No
defer	No	No	Yes	No

As verbs, defer is a hyponym of knuckle under; that is, defer is a word with a more specific, narrower meaning than knuckle under:

Other hyponyms of knuckle under include accede, bow, give in, submit.

knuckle under (verb)	defer (verb)
consent reluctantly	yield to another's wish or opinion
	hold back to a later time