a mixture of rum and water, often flavored with lemon, sugar, and spices and sometimes served hot.
any strong alcoholic drink.
fired and crushed clay.

1760–70; from Old Grog (alluding to his grogram cloak), the nickname of Edward Vernon (died 1757), British admiral, who in 1740 ordered the alcoholic mixture to be served, instead of pure spirits, to sailors. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grog (ɡrɒɡ)
1.  diluted spirit, usually rum, as an alcoholic drink
2.  informal chiefly (Austral), (NZ) alcoholic drink in general, esp spirits
[C18: from Old Grog, nickname of Edward Vernon (1684--1757), British admiral, who in 1740 issued naval rum diluted with water; his nickname arose from his grogram cloak]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1770 (implied in groggy "intoxicated"), supposedly an allusion to Old Grog, nickname of Edward Vernon (1684-1757), British admiral who wore a grogram (q.v.) cloak and who in August 1740 ordered his sailors' rum to be diluted. George Washington's older half-brother Lawrence
served under Vernon in the Carribean and renamed the family's Hunting Creek Plantation in Virginia for him in 1740, calling it Mount Vernon.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Strangers especially are warned either to drink grog or to add a little wine or
  some other spirituous liquor to their water.
Monkey, in sailor language, is the vessel which contains the full allowance of
During the early part of the day, he was dead to the world, grog- gy and glazed.
The best way to avoid a hangover is to go easy on the grog.
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