From WordNet (r) 3.0 (2006):
rile
v 1: cause annoyance in; disturb, especially by minor
irritations; "Mosquitoes buzzing in my ear really bothers
me"; "It irritates me that she never closes the door after
she leaves" [syn: annoy, rag, get to, bother, get
at, irritate, rile, nark, nettle, gravel, vex,
chafe, devil]
2: make turbid by stirring up the sediments of [syn: roil,
rile]