hold down vs retain

hold down and retain both are verbs.

Word	Noun	Adjective	Verb	Adverb
hold down	No	No	Yes	No
retain	No	No	Yes	No

As verbs, retain is a hypernym of hold down; that is, retain is a word with a broader meaning than hold down:

Other hypernyms of hold down include hold, hold back, keep back.

hold down (verb)	retain (verb)
restrain	keep in one's mind
keep	secure and keep for possible future use or application
	allow to remain in a place or position or maintain a property or feature
	hold back within