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[roil] /rɔɪl/
verb (used with object)
to render (water, wine, etc.) turbid by stirring up sediment.
to disturb or disquiet; irritate; vex:
to be roiled by a delay.
verb (used without object)
to move or proceed turbulently.
Origin of roil
1580-90; origin uncertain
Related forms
unroiled, adjective
Can be confused
roil, royal.
2. annoy, fret, ruffle, exasperate, provoke, rile. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for roil
  • In summer the roads roil with bicycles and mopeds and minicars and joggers and walkers.
  • The merger wave is continuing to roil key industries.
  • The announcement is sure to roil an already bubbling controversy over the value of that screening.
  • Internal temperature differences would not have been great enough to roil its liquid outer core and drive the magnetic dynamo.
  • The accusations are the latest of many to roil the church.
  • Neither gathering, however, provided much to roil the normally tranquil weekend news cycle.
  • The discordant moralism of indulging wealthy tyrant's daughters continues to roil the culture industry.
  • There was shelter here from the heavy winds that continued to roil the sound outside.
  • Additionally, winds and all sorts of extra-oceanic inputs can roil the surface.
  • Not only did that roil the market further-it caused a particular problem for hedge funds.
British Dictionary definitions for roil


(transitive) to make (a liquid) cloudy or turbid by stirring up dregs or sediment
(intransitive) (esp of a liquid) to be agitated or disturbed
(intransitive) (dialect) to be noisy or boisterous
(transitive) another word (now rare) for rile (sense 1)
Word Origin
C16: of unknown origin; compare rile
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for roil

1580s, of uncertain origin, probably from Middle French rouiller "to rust, make muddy," from Old French roil "mud, muck, rust" (12c.), from Vulgar Latin *robicula, from Latin robigo "rust" (see robust). An earlier borrowing of the French verb is Middle English roil "to roam or rove about" (early 14c.). Related: Roiled; roiling.

Online Etymology Dictionary, © 2010 Douglas Harper
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