(historical, US, colloquial) A Confederate States dollar during the US Civil War.
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(historical, US, colloquial) A Confederate soldier during the US Civil War (because of the grey uniforms).
...to resist the farther advance of the greybacks.
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(dated) A louse.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.