1) to disappear, vanish, cease, fail 1a) (Qal) to vanish
Full Brown-Driver-Briggs lexicon entry
II. [פָסַס] verbdisappear, vanish (si vera lectio, compare Assyrian pasâsu, do away, blot out (especially sins)); —
QalPerfect 3 plural פַּסּוּ מִןPs 12:2 the faithful have vanished (Che Dr) from (among) . . . men; LagProph. Chald. xivi Gr We Du read אָֽפְסוּ (Isa 16:4).