Finif

Doublet of five: 

finif (Alternative forms: finiff, finnif, finniff) 

From Yiddish פֿינף‎ (finf, “five”). 

Noun: 

Doublet of five.(US slang, dated) 

A five-dollar bill; 

A monetary note of five pounds. 

see. finnif. 

Look it up on Wiktionary 

Photo: Pixabay/GDJ 

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