kesiti

1. colloq. derog. (kesiti se) to grin; to smirk
   Šta se kesiš, nije smešno! — What are you grinning at? It's not funny!
   Stajao je u uglu i kesio se. — He stood in the corner, smirking.
2. (kesiti zube) to bare one's teeth
   Pas je režao i kesio zube. — The dog was growling and baring its teeth.