mutiti

1. (of liquid) to muddy; to stir up
   Deca mute vodu u potoku kamenjem. — The kids are muddying the stream with stones.
2. to confuse; to muddle; to stir up trouble
   Ne muti mi glavu tim pričama. — Don't confuse me with those stories.
   Neko stalno muti u našem timu. — Someone keeps stirring up trouble in our team.
3. colloq. to scheme; to hustle; to be up to something
   On uvek nešto muti sa nekim ljudima. — He's always up to something with some people.
4. slang (sa + instr.) to have a fling; to be seeing someone
   Čujem da Marko muti sa njenom drugaricom. — I hear Marko has a thing going with her friend.
5. (of eggs, cream, batter) to beat; to whisk; to mix
   Mutite jaja sa šećerom dok ne pobele. — Beat the eggs with sugar until they turn pale.
6. (mutiti se, of vision, mind) to blur; to become hazy
   Muti mi se pred očima od umora. — My vision is blurring from tiredness.

The perfective is zamutiti (of water, of the head), pomutiti (of mind, thoughts), umutiti (of eggs, cream).