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too big for your boots

UK (US too big for your britches) informal

Definition

behaving as if you are more important than you really are: He's been getting a bit too big for his boots since he got that promotion.Showing arrogance and conceitConfidence and self-assuranceBoasting
(Definition of too big for your boots from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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