pin down vs confine

pin down and confine both are verbs.

Word	Noun	Adjective	Verb	Adverb
pin down	No	No	Yes	No
confine	No	No	Yes	No

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

Other hypernyms of pin down include detain.

pin down (verb)	confine (verb)
define clearly	place limits on (extent or amount or access)
attach with or as if with a pin	to close within bounds, or otherwise limit or deprive of free movement
place in a confining or embarrassing position	prevent from leaving or from being removed
	deprive of freedom; take into confinement
	close in