isprazniti

1. to empty; to clear out
   Ispraznio je džepove na sto. — He emptied his pockets onto the table.
   Policija je ispraznila zgradu zbog dojave o bombi. — The police cleared the building after a bomb threat.
2. (isprazniti se, of a place) to empty; to become empty
   Posle utakmice stadion se brzo ispraznio. — After the match the stadium quickly emptied.
3. (isprazniti se, of a battery) to go flat; to run down
   Ispraznio mi se telefon, ne mogu da te zovem. — My phone died, so I can't call you.

The imperfective is prazniti.