Mutilate

ばらばらにする

barabara ni suru

(To physically harm as to impair use)

不具にする

fugu ni suru

(To physically harm as to impair use)

切断する

setsudan suru

(To physically harm as to impair use)

骨抜きにする

honenuki ni suru

(To render imperfect or defective)