Therefore
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Safin（讨论 | 贡献）2022年4月26日 (二) 23:57的版本 （建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/therefore ref] From [https://en.wikipedia.org/wiki/Middle_English Middle English] therfor…”的新页面）
wiktionary
From Middle English therfore, therfor, tharfore, thorfore; synchronically a univerbation of there(pronomial adverb) + for. Compare Saterland Frisian deerfoar, Dutch daarvoor, German dafür, Danish and Norwegian derfor, Swedish därför.
etymonline
therefore (adv.)
Old English þærfore; from there + fore, Old English and Middle English collateral form of for. Since c. 1800, therefor has been used in sense of "for that, by reason of that;" and therefore in sense of "in consequence of that." Similar formation in Dutch daarvoor, German dafür, Danish derfor.
