grayback

[ grey-bak ]
/ ˈgreɪˌbæk /
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noun

any of various marine and aquatic animals that are dark gray above and light-colored or white below, as the gray whale, the alewife, certain whitefish, and certain sandpipers.
Informal. a Confederate soldier.

Origin of grayback

First recorded in 1805–15; gray1 + back1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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