To render turbid by stirring up the dregs or sediment of.
to roil wine, cider, etc, in casks or bottles
To bubble, seethe.
By noon, Brian's stomach had begun to roil and knot. He hurried down to the bathroom at the end of the hall in his stocking feet, closed the door, and vomited into the toilet bowl as quietly as he could.
Origin uncertain. Possibly from French or Middle French rouiller (“to rust, make muddy”), from Old French rouil (“mud, rust”), from Vulgar Latin *robicula, from Latin robigo (“rust, blight”)
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