The Collaborative International Dictionary of English v.0.48:

Rile \Rile\ (r[imac]l), v. t. [imp. & p. p. Riled (r[imac]ld);
   p. pr. & vb. n. Riling.] [See Roil.]
   1. To render turbid or muddy; to stir up; to roil.
      [1913 Webster]

   2. To stir up in feelings; to make angry; to vex.
      [1913 Webster]

   Note: In both senses provincial in England and colloquial in
         the United States.
         [1913 Webster]