Green’s Dictionary of Slang

Cush n.

[the legendary Kingdom of Kush, in ancient Nubia (now northern Sudan)]

(US black) generic for an African-American; also attrib.

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[US]D. Burley N.Y. Amsterdam News 17 Jan. 21: One of their recent cover girls whom they figured to have ‘classical Latin features’ revealed [...] that she is kin to Cush!
[US]D. Burley N.Y. Amsterdam News 17 Jan. 21: Several of the Cush leaders in town heard about the marriage!