One of the mysteries of the English language finally explained.
1The blood of a living person or animal. Also: blood drawn directly from a person or animal when living or immediately after death, especially while it remains unclotted or contains living cells.
2Slight involuntary twitching of a muscle, especially of the eyelids; myokymia. Compare earlier "lifeblood".
Early 17th century; earliest use found in Thomas Middleton (d. 1627), playwright. From live + blood, as an alteration of lifeblood.
live blood/ˈlʌɪv blʌd/
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