ETYM French sou, Old Fren. sol, from Latin solidus a gold coin, in Late Lat., a coin of less value. Related to Sold, Solid, and and cf. Sol, Soldo.
(Homonym: Sioux, sue).
A former French coin of low denomination; often used of any small amount of money.
Former French coin, one-twentieth part of franc; any coin or amount of minimum value.