Note 48 — Chapter XVI · ADVICE TO INVETERATE DRUNKARDS.
Reading edition
The origin of the term “grog” is curious. Before the time of Admiral Vernon, rum was given in its raw state to the seamen; but he ordered it to be diluted, previous to delivery, with a certain quantity of water. So incensed were the tars at this watering of their favourite liquor, that they nicknamed the Admiral Old Grog, in allusion to a grogram coat which he was in the habit of wearing: hence the name.