constrain vs pound up

constrain and pound up both are verbs.

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

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

constrain: 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 constrain include bind, tie down, tie up, truss, fetter, shackle, enchain, pinion, shackle, impound, pound, pound, fold, pen up, ground.

constrain (verb)	pound up (verb)
severely restrict in scope or extent	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
compel to behave in a certain way