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English definition of “be a one”

be a one

UK old-fashioned informal
to be funny in a slightly rude way or in a way that shows no respect: "He told me I couldn't have the job and I told him I never really wanted it in the first place." "Ooh, you are a one."Exceptional qualities, things and people
(Definition of be a one from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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