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without so much as a by-your-leave

old-fashioned disapproving

Definition

without asking for permission: That's twice now he's just walked in here without so much as a by-your-leave and picked a book off the shelf!Rude and cheekyRelating to sex and sexual desire
(Definition of without so much as a by-your-leave from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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