cutting one's arm in self-harm

to cut one's arm in self-harm

hairstyle where the sideburns are shaved to the top of the ear

(fandom slang, film, television, ACG) a fanservice scene (an often racy or sexual scene included in a work of fiction merely to excite the viewer)

(rail transport) selective door operation

necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

necessary evil

a surgical procedure in which the vasa deferentia of a man are severed, and then tied/sealed in a manner which prevents sperm from entering the seminal stream; vasectomy