from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. Originally used to form the second person singular of be, but can denote other present tense forms, such as: are, am, is


From Middle English bist, beest, best, from Old English bist ("(thou) art"; second person singular of bēon ("to be")), from Proto-Germanic *biusi (“(thou) art”), equivalent to be +‎ -est. Cognate with West Frisian bist ("(thou) art"), Low German büst ("(thou) art"), German bist ("(thou) art"). (Wiktionary)


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