deaden

make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation

“deaden a sound”

cut a girdle around so as to kill by interrupting the circulation of water and nutrients

make vague or obscure or make (an image) less visible

become lifeless, less lively, intense, or active; lose life, force, or vigor

convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil

lessen the momentum or velocity of

“deaden a ship's headway”

make vapid or deprive of spirit

“deadened wine”