prepadati

1. to frighten; to scare
   Nemoj da me prepadaš tako, srce će mi stati! — Don't scare me like that, my heart will stop!
   Stalno prepada decu pričama o vukovima. — He keeps scaring the kids with stories about wolves.
2. (prepadati se) to get scared; to be frightened
   Ne prepadaj se, to je samo mačka. — Don't be scared, it's just a cat.
   Ona se prepada svakog šuma u kući. — She gets frightened at every noise in the house.

The perfective is prepasti; prepadati se usually takes the genitive (prepada se psa).