klati

1. (of livestock) to slaughter; to butcher
   Deda svake zime kolje prase. — Grandpa slaughters a pig every winter.
   Za Božić su klali jagnje. — They slaughtered a lamb for Christmas.
2. (of people) to butcher; to massacre
   U tom ratu su klali i civile. — In that war they butchered civilians too.
3. colloq. (klati se) to be at each other's throats; to fight bitterly
   Komšije se već godinama kolju zbog ograde. — The neighbours have been at each other's throats over the fence for years.

In the literal senses (slaughter, kill) the perfective is zaklati; the figurative klati se 'be at each other's throats' usually has no perfective counterpart. The present tense is koljem, kolješ.