Meaning of “you could have knocked me down/over with a feather” in the English Dictionary

british dictionary

"you could have knocked me down/over with a feather" in British English

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you could have knocked me down/over with a feather

saying

said when you are extremely surprised

(Definition of “you could have knocked me down/over with a feather” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)