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S
You have crossed your S (French). You have cheated me in your
account; you have charged me pounds where you ought to have charged
shillings, or shillings where you ought to have charged pence. In the
old French accounts, f ( = s) stood for sous or pence, and f for francs. To cross your f meant therefore to turn it
fraudulently into f.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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