Definition of roil in English:


Line breaks: roil
Pronunciation: /rɔɪl


1 [with object] literary Make (a liquid) turbid or muddy by disturbing the sediment: winds roil these waters
1.1 [no object] (Of a liquid) move in a turbulent, swirling manner: the sea roiled below her
More example sentences
  • The water roils around the combatants, and the sky is filled with clouds and tiny lines that intensify the sense of cataclysm.
  • The core mantle boundary is a complex and dynamic area that churns and chugs as the liquid iron core roils at the bottom of the rock-like mantle.
  • The North Sea roils just off the former hippie village of Monster, 40 miles southwest of Amsterdam.
2 US term for rile (sense 1).
More example sentences
  • That roiled his colleagues and, some argued, prolonged a stoppage that wiped out the World Series.
  • That comment still roils the ultra-liberal faculty at the university.
  • Any religious film with violence is bound to roil some people.


late 16th century: perhaps from Old French ruiler 'mix mortar', from late Latin regulare 'regulate'.

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