/ · 1894 Brewer’s · F · Fin
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The hand. A contraction of finger. Thus we say, “Give us your fin”—i.e. shake hands. The derivation from a fish’s fin is good only for a joke.
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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.
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