buckle under vs submit

buckle under and submit both are verbs.

Word	Noun	Adjective	Verb	Adverb
buckle under	No	No	Yes	No
submit	No	No	Yes	No

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

Other hyponyms of buckle under include accede, bow, defer, give in.

buckle under (verb)	submit (verb)
consent reluctantly	accept as inevitable
	accept or undergo, often unwillingly
	put before
	refer for judgment or consideration
	yield to another's wish or opinion
	yield to the control of another
	make an application as for a job or funding
	hand over formally
	make over as a return
	refer to another person for decision or judgment