grog /ɡrɒɡ $ ɡrɑːɡ/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Origin: Old Grog , a name given (because he wore a coat of grogram , a type of rough cloth) to Edward Vernon, the 18th-century British navy officer who started the practice of giving sailors rum and water to drink ]
1 . a strong alcoholic drink, especially ↑ rum mixed with water
2 . informal any alcoholic drink