Open Multilingual Wordnet 1.3

00223500-v (2) V1	weaken	become weaker
00390215-v (2) V1, V2	break, soften, dampen, weaken, damp	lessen in force or effect
00290740-v (1) V2	weaken, de-escalate, step down	reduce the level or intensity or size or scope of
02543607-v (8) V2	undermine, weaken, countermine, subvert, sabotage, counteract	destroy property or hinder normal operations
00224901-v (6) V2	weaken	lessen the strength of