Definition of "sou"

sou

/suː/

noun
plural sous
1. (historical) An old French copper coin equal to one twentieth of a livre or twelve deniers; one sou is to the livre as one shilling is to the pound.
  Quotations
  He is grey, flat-footed and withered, with long, brittle nails that set your nerves on edge while he scrapes up your two sous.
  1918 February (date written), Katherine Mansfield [pseudonym; Kathleen Mansfield Murry], “Je ne parle pas français”, in Bliss and Other Stories, London: Constable & Company, published 1920, page 73
2. (dated, slang) Cent; pocket money.
3. (dated) A thing of the smallest value; a whit; a jot.