One of the mysteries of the English language finally explained.
with object To suck blood from (a person or animal); especially (figurative): to extort money from (a person), to rob (someone) by extortion; to extort (money, etc.); to pillage, plunder (a country, territory, etc.).
Mid 16th century; earliest use found in Robert Copland (fl. 1505–1547), translator and printer. From blood + suck, after to suck (the) blood (of), bloodsucker.
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