\Roil\, v. t. [imp. & p. p. {Roiled}; p. pr. & vb. n.
{Roiling}.] [Cf. OE. roilen to wander; possibly fr. OF.
roeler to roll, equiv. to F. rouler. See {Roll}, v., and cf.
{Rile}.]
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.

\Roil\, v. i.
1. To wander; to roam. [Obs.]
2. To romp. [Prov. Eng.] --Halliwell.