utopiti

1. (utopiti se) to drown
   Dečak se umalo utopio u Dunavu. — The boy nearly drowned in the Danube.
   Prošlog leta se na plaži utopio jedan turista. — Last summer a tourist drowned at the beach.
2. (+ acc.) to drown
   Poplava je utopila desetine ovaca u selu. — The flood drowned dozens of sheep in the village.
   Brat je iz šale pokušao da me utopi u bazenu. — My brother jokingly tried to drown me in the pool.
3. (utopiti se u + acc.) to blend in; to disappear into
   Lopov se brzo utopio u masu na pijaci. — The thief quickly disappeared into the crowd at the market.
4. colloq. (+ acc.) to offload; to sell off
   Uspeo je da utopi stari auto. — He managed to offload the old car.

In the sense 'to drown (die)' the verb takes se: utopio se; udaviti se is equally common in Serbia.