unbrace vs weaken

unbrace and weaken both are verbs.

Word	Noun	Adjective	Verb	Adverb
unbrace	No	No	Yes	No
weaken	No	No	Yes	No

As verbs, weaken is a hypernym of unbrace; that is, weaken is a word with a broader meaning than unbrace:

unbrace (verb)	weaken (verb)
remove a brace or braces from	become weaker
remove from tension	lessen the strength of
undo the ties of	reduce the level or intensity or size or scope of
	lessen in force or effect
	destroy property or hinder normal operations