otpadati

1. to fall off; to come off
   Malter otpada sa zidova u hodniku. — Plaster is falling off the walls in the hallway.
   S drveća već otpada lišće. — Leaves are already falling from the trees.
2. colloq. (of a class, meeting) to be cancelled; to be off
   Današnji čas otpada jer je profesor bolestan. — Today's class is cancelled because the teacher is ill.
3. (+ na + acc.) to account for; to go on
   Na hranu nam otpada skoro pola plate. — Almost half our salary goes on food.
4. (in a competition) to be eliminated; to drop out
   Favoriti otpadaju jedan za drugim. — The favourites are being knocked out one after another.
5. (of an option, possibility) to be ruled out; to no longer be an option
   Ta mogućnost otpada. — That option is ruled out.

The perfective is otpasti.