GNU Collaborative International Dictionary of English

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1.       
   Grog , 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