Meaning of “at/in one fell swoop” in the English Dictionary

british dictionary

"at/in one fell swoop" in British English

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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.

(Definition of “at/in one fell swoop” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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