GNU Collaborative International Dictionary of English

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1.       
   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.
   
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   2. To disturb, as the temper; to ruffle the temper of; to rouse the passion of resentment in; to perplex.
   
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   That his friends should believe it, was what roiled him [Judge Jeffreys] exceedingly. R. North.
   
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   ☞ Provincial in England and colloquial in the United States. A commoner, but less approved, form is rile.
   
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