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sou (iou)



sou noun. [su:] L15.
[French, sing. form deduced from sous, soux pl. of Old French sout from Latin solidus (sc. nummus coin) use as noun of solidus SOLID adjective: see SOLIDUS. Cf. SOL noun3, SOUSE noun4.]
Hist. A French coin, at one time a twentieth of a livre, later a five-centime piece. Cf. SOLDO.
not a sou colloq. no money at all.