zaviriti

1. (+ u + acc.) to peep; to peek
   Dete je zavirilo u kutiju sa poklonima. — The child peeked into the box of presents.
   Zavirila sam kroz ključaonicu. — I peeped through the keyhole.
2. (briefly, in passing) to take a quick look; to drop in
   Zaviri u ovaj članak kad stigneš. — Take a quick look at this article when you get a chance.
   Zavirio sam kod Marka posle posla. — I dropped in on Marko after work.

Usually used with u + acc. (zaviriti u sobu) or kroz (zaviriti kroz prozor).