Grog was a mixture of weak beer and rum dished out to sailors in the Royal Navy.
There was a daily rum ration and to water it down they would add weak beer.
Water would go foul on long voyages and so the only way to keep themselves hydrated was by drinking grog.
To much grog led to felling groggy (unwell)
I was a sea cadet as a kid, and this was what we were taught at Greenwich Naval Academy.
I have heard other explanations but I like this one as it makes sense.
Sailors and officers on British and many other warships used to have a daily ration of rum, to keep them warm and cheerful. In 1740, Admiral Vernon of the British West Indies fleet ordered that this rum ration should be diluted with water.
Admiral Vernon used to wear a coat made of grogram, a thick material made of silk and wool stiffened with gum. His nickname was 'Old Grog', because of his coat, and the diluted rum became known as 'grog'.
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