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English definition of “at/in one fell swoop”

at/in one fell swoop

If you do something at/in one fell swoop, you do it all at the same time: I got all my Christmas shopping done in one fell swoop.Complete and wholeVery and extremeImmediately
(Definition of at/in one fell swoop from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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