gricnuti

1. (+ acc.) to take a nibble at; to take a small bite of
   Gricnula je jabuku i vratila je na sto. — She took a bite of the apple and put it back on the table.
2. colloq. to have a quick bite; to grab a snack
   Hajde da gricnemo nešto pre bioskopa. — Let's grab a bite before the movie.
3. (of an animal, person) to nip; to give a little bite
   Kuče me je gricnulo za prst. — The puppy nipped my finger.

The imperfective is grickati.