prestraviti

1. (+ acc.) to terrify; to scare to death
   Ta vest je prestravila celu porodicu. — The news terrified the whole family.
   Pas je iskočio i prestravio dete. — The dog jumped out and scared the child to death.
2. (prestraviti se) to be terrified; to get scared to death
   Prestravila sam se kad je nestalo struje. — I was terrified when the power went out.

The imperfective is prestravljivati; the participle prestravljen "terrified" is very common.