roil

The story

1. Latin · derived fromrobigo“rust, blight”
2. Vulgar Latin · derived from*robicula
3. Old French · derived fromrouil“mud, rust”
4. Middle French · derived fromrouiller“to rust, make muddy”
5. English todayroil

Origin uncertain. Possibly from French or Middle French rouiller (“to rust, make muddy”), from Old French rouil (“mud, rust”), from Vulgar Latin *robicula, from Latin robigo (“rust, blight”)