do one's worst

do one's worst (third-person singular simple present does one's worst, present participle doing one's worst, simple past did one's worst, past participle done one's worst)

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• do one's best

• “do one's worst”, in Lexico, Dictionary.com; Oxford University Press, 2019–present.
• “do your worst” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.
• “do your his her their worst” in Longman Dictionary of Contemporary English, Longman.
• “do your worst” (US) / “do your worst” (UK) in Macmillan English Dictionary.