grog

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grog spirits (orig. rum) and water as served out to the Royal Navy. XVIII. Said to be from ‘Old Grog’', reputed nickname of the Admiral Vernon who gave the order in 1740 for the mixture to be used instead of neat spirit, derived from his wearing a grogram cloak.
Hence groggy intoxicated XVIII; (of a horse) diseased or weak in the forelegs; shaky, tottering XIX.

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