WordWeb Online

1. Cause annoyance in; disturb, especially by minor irritations
   "Mosquitoes buzzing in my ear really riles me";
   - annoy, rag, get to, bother, get at [informal], irritate, nark [Brit, slang], nettle, gravel [US], vex, chafe, devil, tick off [informal], roil [N. Amer]
    
2. [N. Amer] Make turbid by stirring up the sediments of
   - roil

Derived forms: riled, riling, riles

Type of: agitate, commove, displease, disturb, raise up, shake up, stir up, vex