Verbs

(v)weakenlessen the strength of“The fever weakened his body”
(v)weakenbecome weaker“The prisoner's resistance weakened after seven days”
(v)sabotage, undermine, countermine, counteract, subvert, weakendestroy property or hinder normal operations“The Resistance sabotaged railroad operations during the war”
(v)de-escalate, weaken, step downreduce the level or intensity or size or scope of“de-escalate a crisis”
(v)dampen, damp, soften, weaken, breaklessen in force or effect“soften a shock”, “break a fall”