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)

Provincial in England and colloquial in the United States. A commoner, but less approved, form is rile.

Origin: Cf. OE. Roilen to wander; possibly fr. OF. Roeler to roll, equiv. To F. Rouler. See Roll, and cf. Rile.

(01 Mar 1998)