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English definition of “on no account”

on no account

C2 If something must on no account/not on any account be done, it must not be done at any time or for any reason: Employees must on no account make personal phone calls from the office. These records must not on any account be changed.Yes, no and not
(Definition of on no account from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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