What does roil mean?
Roil means to stir, churn, or make agitated. The word is often used for water or another liquid in violent, turbulent motion, as in “the river roiled beneath the bridge,” but it can also describe the effect on people or situations: “a scandal roiled the organization.” Its figurative use suggests disorder, excitement, or emotional disturbance rather than calm or settled activity. Roil is heard in both British and American English and has a somewhat literary tone, making it especially effective in descriptive writing. In idiomatic usage, “to roil the waters” means to create conflict, controversy, or trouble in an otherwise calm situation. The verb can be transitive, as in “the wind roiled the bay,” or intransitive, as in “the crowd roiled with anger.”
To stir or churn a liquid, causing it to move turbulently; to become turbulent or unsettled.
"The currents roiled beneath the surface of the lake."
Also used figuratively for people, emotions, and situations becoming agitated or unsettled.
A state of turbulence, agitation, or commotion.
"The report was met with a roil of protest."
This noun use is less common than the verb and is chiefly literary.
The plural is rarely needed and is chiefly used when referring to several acts or instances of turbulence.
"The novel describes the roils of the river during the spring flood."
When a stormy sea “roils,” it does not merely ripple: it churns and heaves with restless, swirling motion.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does roil come from?
The English word entered use in the late 16th century from the French verb rouiller, meaning “to stir” or “churn.” The deeper origin of the French word is uncertain, although it may be connected with an older term associated with rust or agitation. Modern English retains both literal and figurative senses.
Related word forms
How roil is actually used
Roil is somewhat literary and evocative. It is especially common in descriptions of turbulent water and figurative descriptions of emotionally or politically unsettled situations.
Easily confused with roil
Roil usually means to stir or agitate something, especially a liquid or a situation, whereas rile means to make a person angry or irritated.