provaljivati

1. (u + acc.) to break into; to burgle; to invade
   Neko provaljuje u automobile u našoj ulici. — Someone keeps breaking into cars on our street.
   Lopovi su provaljivali u vikendice tokom zime. — Thieves broke into weekend cottages during the winter.
2. slang (someone, something) to figure out; to notice; to see through
   Uvek ga provaljujem kad laže. — I always see through him when he lies.
   Polako provaljujem kako ovaj program radi. — I'm slowly figuring out how this program works.
3. slang (of jokes) to crack jokes
   Celo veče je provaljivao fore i svi su se smejali. — He was cracking jokes all evening and everyone laughed.
4. slang (of silly remarks) to blurt out silly or absurd things
   Opet provaljuje gluposti pred svima. — He's blurting out nonsense in front of everyone again.

In the sense "break into" it takes u + acc.: provaljivati u stan.