oticati

1. (of a body part) to swell
   Noge mi otiču kad dugo stojim. — My legs swell when I stand for a long time.
   Posle uboda pčele ruka mu je sve više oticala. — After the bee sting his arm kept swelling more and more.
2. (of water, liquid) to drain; to flow off
   Voda ne otiče jer je slivnik zapušen. — The water isn't draining because the drain is clogged.

It is the imperfective of two different verbs oteći: 'to swell' and 'to flow off'.