weaken

(verb) lessen the strength of. Examples: "The fever weakened his body."

(verb) become weaker. Examples: "The prisoner's resistance weakened after seven days."

(verb) destroy property or hinder normal operations. Synonyms: sabotage, undermine, countermine, counteract, subvert. Examples: "The resistance sabotaged railroad operations during the war."

(verb) reduce the level or intensity or size or scope of. Synonyms: de-escalate, step down. Examples: "De-escalate a crisis."

(verb) lessen in force or effect. Synonyms: dampen, damp, soften, break. Examples: "Soften a shock." "Break a fall."