Buck: (Hind.–Bâk). Exaggeration. Too full of talk, for example, "Shut up there, not so much of your buck." Originally old army and to some extent general slang for tall talk or bragging. A U.S. army term for a Private, a smart sldier–A Buck Private. 
References / notes
- Edward Fraser and John Gibbons (1925). Soldier and Sailor Words and Phrases. Routledge, London p.37.
Glossary of words and phrases
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