- To roil is to agitate or make angry.
- An example of roil is for someone to upset protestors with an angry speech.
- An example of roil is to make river water cloudy as you stir up the sediment from the bank.
- to make (a liquid) cloudy, muddy, or unsettled by stirring up the sediment
- to stir up; agitate
- to make angry or irritable; rile
Origin: Fr rouiller from Old French rouil, roille, rust, mud, ultimately from Classical Latin robigo, rust, akin to ruber, red
Used by arrangement with John Wiley & Sons, Inc.
verb roiled, roil·ing, roils verb, transitive
- To make (a liquid) muddy or cloudy by stirring up sediment.
- To displease or disturb; vex: My roommate's off-putting habits began to roil me.
Origin: Origin unknown.