DICT.TW Dictionary Taiwan

 Roil v. t. [imp. & p. p. Roiled; p. pr. & vb. n. Roiling.]
 1. To render turbid by stirring up the dregs or sediment of; as, to roil wine, cider, etc. , in casks or bottles; to roil a spring.
 2. To disturb, as the temper; to ruffle the temper of; to rouse the passion of resentment in; to perplex.
    That his friends should believe it, was what roiled him [Judge Jeffreys] exceedingly.   --R. North.
 Note: ☞ Provincial in England and colloquial in the United States. A commoner, but less approved, form is rile.

 roiling
      adj : (of a liquid) agitated vigorously; in a state of turbulence;
            "the river's roiling current"; "turbulent rapids" [syn:
             churning, roiled, roily, turbulent]