n. a five-dollar bill. (Germanic via Yiddish. As in German funf = five.) : I gave the old guy a finn, and he nearly passed out.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
Finn
O.E. finnas, from O.N. finnr, the Norsemen's name for the Suomi. Some suggest a connection with fen.