DuckCorp Dico

Found one definition

1.                 From 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]