tighten vs wind up

tighten and wind up both are verbs.

Word	Noun	Adjective	Verb	Adverb
tighten	No	No	Yes	No
wind up	No	No	Yes	No

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

Other hyponyms of tighten include frap, firm, tauten, screw, wind.

tighten (verb)	wind up (verb)
become tight or tighter	finally be or do something
make tight or tighter	coil the spring of (some mechanical device) by turning a stem
severely restrict in scope or extent	to evoke sexual feelings
narrow or limit	give a preliminary swing to the arm pitching