From Middle English blodleten, from Old English blōdl?tan ?(“to let blood, bleed”), equivalent to blood +? let. Cognate with German Blutlassen ?(“bloodletting”), Icelandic blóelátinn ?(“bled”, past participle).
FROM: wiktionary
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bloodlet:
来自中世纪英语blodleten, 来自古英语blōdl?tan("to let blood, bleed"), 等价于blood + let. 同源于德语Blutlassen("bloodletting"), 冰岛语blóelátinn("bled").