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From The Collaborative International Dictionary of English v.0.48:
Grog \Grog\ (gr[o^]g), n. [So named from "Old Grog" a nickname given to Admiral Vernon, in allusion to his wearing a grogram cloak in foul weather. He is said to have been the first to dilute the rum of the sailors (about 1745).] A mixture of spirit and water not sweetened; hence, any intoxicating liquor. [1913 Webster] Grog blossom, a redness on the nose or face of persons who drink ardent spirits to excess. [Collog.] [1913 Webster]