buniti

1. (buniti se) to protest; to complain; to object
   Stalno se buniš, ništa ti ne valja. — You're always complaining, nothing is good enough for you.
   Radnici se bune protiv niskih plata. — The workers are protesting against low wages.
2. (buniti se) to rebel; to revolt
   Narod se vekovima bunio protiv stranih vladara. — For centuries the people rebelled against foreign rulers.
3. (+ acc.) to confuse; to puzzle
   Ne buni me, pokušavam da izračunam. — Don't confuse me, I'm trying to work it out.
   Buni me što se još nije javio. — It puzzles me that he still hasn't called.
4. (someone against something) to incite to rebellion; to stir up
   Bunio je narod protiv vlasti. — He was inciting the people against the government.

Mostly used as buniti se; 'against something' is buniti se protiv + gen.