Bought

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Old English bycgan, of Germanic origin.

wiktionary

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See buy.

From Middle English bought, bowght, bouȝt, *buȝt, probably an alteration of bight, biȝt, byȝt(“bend, bight”) after bowen, buwen, buȝen(“to bow, bend”). Cognate with Scots boucht, bucht, bout(“bend”). More at bight.

etymonline

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bought

past tense and past participle of buy (v.).