Shoe the Horse (To)
. (French, Ferrer la mule.) Means to cheat one’s employer out of a small sum of money. The expression is derived from the ancient practice of grooms, who charged their masters for “shoeing,” but pocketed the money themselves.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.