ogovarati

1. to gossip about; to badmouth
   Ne volim da ogovaram ljude iza leđa. — I don't like badmouthing people behind their backs.
   Komšinice stalno ogovaraju novu stanarku. — The neighbors keep gossiping about the new tenant.

Takes a direct object in the accusative: ogovarati koga, with no preposition.