oprosti

опрости

INTERJECTION

(to one person, informal) sorry

Oprosti, nisam hteo da te uvredim. — Sorry, I didn't mean to offend you.
(to get attention) excuse me

Oprosti, znaš li koliko je sati? — Excuse me, do you know what time it is?

To several people or formally, say oprostite; in everyday speech izvini is more frequent.