kositi

1. (kositi se sa + instr.) to clash; to be at odds; to contradict
   Ova odluka se kosi sa zakonom. — This decision is at odds with the law.
   To se kosi sa mojim principima. — That goes against my principles.
2. to mow
   Deda svake subote kosi travu u dvorištu. — Grandpa mows the grass in the yard every Saturday.
3. (of war, disease) to mow down; to cut down
   Epidemija je kosila ljude po selima. — The epidemic was cutting people down across the villages.

Kositi se is usually used in the third person about decisions, ideas or laws.