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1. slang Rum that has been diluted with water. The name refers to Edward Vernon, an 18th-century British admiral, nicknamed "Old Grog," who ordered that his sailors receive that mixture instead of pure rum. (Vernon was known for wearing a grogram cloak, hence the nickname.) Ugh, is this grog? Get me the real stuff!
2. slang By extension, a drink containing liquor. If I have any more of that grog, I won't be able to see straight.
slang One who is apt to drink alcohol often and excessively; an alcoholic. "Grog" refers to rum that has been diluted with water. It was named after Edward Vernon, an 18th-century British admiral nicknamed "Old Grog" (because he wore a grogram cloak) who ordered that his sailors receive that mixture instead of pure rum. Geez, if we go to the bar a third time this week, we're gonna look like a couple of groghounds!
n. liquor. Here, have some more of this grog.
n. a drunkard. I’m afraid that Ernie is getting to be a groghound.