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The name for the naval measure of rum introduced by Admiral Vernon in 1740 (his nickname was "old Grog" after the old cloak of grogram he wore in rough weather).
Vernon"s rum was more dilute than what had previously been offered - the original strength meant sailors were been given a neat half-pint of spirits of over 90 degrees per day - some of them thus finding the negotiation of the rigging too much of a challenge after such dose. In 1795 lemon juice was added to this rum. See 'Limeys'