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I drank a little to much last night, and one of my friends suggested "the hair of the dog" to cure my hangover. Where did this saying come from?

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up vote 10 down vote accepted

The full phrase is "the hair of the dog that bit you" (from Wikipedia):

The expression originally referred to a method of treatment of a rabid dog bite by placing hair from the dog in the bite wound. The use of the phrase as a metaphor for a hangover treatment dates back to the time of William Shakespeare.

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Ah, interesting. I was wondering if the next ingredient was going to be eye of newt. – mmyers Nov 20 '10 at 20:41

Following on from Kosmo's answer, it also implies that, by drinking alcohol to cure your hangover, you're ingesting more of the same thing that hurt you in the first place.

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