poskočiti

1. to jump; to hop; to jump up
   Kad je čula vest, poskočila je od sreće. — When she heard the news, she jumped for joy.
   Poskočio sam od straha kad su se vrata zalupila. — I jumped in fright when the door slammed.
2. (of prices, temperature) to jump; to rise sharply
   Cene struje su ponovo poskočile. — Electricity prices have jumped again.
   Detetu je noću poskočila temperatura. — The child's temperature shot up during the night.

The imperfective is poskakivati.