Definition of roil from the Oxford Advanced Learner's Dictionary



    BrE BrE//rɔɪl//
    ; NAmE NAmE//rɔɪl//
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  1. 1(North American English) = rile
  2. 2[intransitive, transitive] (literary, formal) (of a liquid, cloud, surface, etc.) to move quickly and violently in different directions; to make a liquid, cloud, surface, etc. move quickly and violently in different directions The waves roiled and crashed up against the side of the ship. The clouds roiled above in the dark sky. roil something Winds often roil the sea here. (figurative) The collapse of the mortgage sector has roiled markets. The minister was accused of roiling the political waters.
See the Oxford Advanced American Dictionary entry: roil