Etymology
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sou (n.)

small French coin, 1550s, back-formation from sous, plural of Old French soul, formerly a coin worth one-twentieth of a livre, from Latin solidus (see solidus).

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Definitions of sou

sou (n.)
a former French coin of low denomination; often used of any small amount of money;
he hasn't a sou to his name
From wordnet.princeton.edu