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I know that the bad blood expression means animosity and dislike. But where does it come from? I can understand why bad, but why blood, and whose blood is implied here?

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up vote 4 down vote accepted

As far as I know, it comes from “blood feuds” between families, clans, or tribes. Have a look at Wiktionary’s definition. One of the earliest appearances seems to be in Essays of Elia by Charles Lamb in 1823.

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