restrain vs pound up

restrain and pound up both are verbs.

Word	Noun	Adjective	Verb	Adverb
restrain	No	No	Yes	No
pound up	No	No	Yes	No

As verbs, pound up is a hyponym of restrain; that is, pound up is a word with a more specific, narrower meaning than restrain:

restrain: to close within bounds, or otherwise limit or deprive of free movement
pound up: shut up or confine in any enclosure or within any bounds or limits

Other hyponyms of restrain include bind, tie down, tie up, truss, fetter, shackle, enchain, pinion, shackle, impound, pound, pound, fold, pen up, ground.

restrain (verb)	pound up (verb)
prevent the action or expression of	shut up or confine in any enclosure or within any bounds or limits
to close within bounds, or otherwise limit or deprive of free movement
restrict (someone or something) so as to make free movement difficult
prevent (someone or something) from doing something