zavući

1. (into or under something) to tuck; to slip; to stick
   Zavukao je ruke u džepove. — He stuck his hands in his pockets.
   Zavukla je pismo pod jastuk. — She slipped the letter under the pillow.
2. (zavući se) to crawl into; to creep into; to hide
   Mačka se zavukla pod krevet. — The cat crawled under the bed.
   Zavukao se pod ćebe i zaspao. — He crawled under the blanket and fell asleep.

The imperfective is zavlačiti; colloquially zavlačiti nekoga means to string someone along.