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English definition of “before you can say Jack Robinson”

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before you can say Jack Robinson

old-fashioned informal
used to say that something happens very quickly: Before you could say Jack Robinson, she'd jumped into the car and driven away.
Translations of “before you can say Jack Robinson”
in Chinese (Traditional) 轉瞬間,一眨眼…
in Chinese (Simplified) 转瞬间,一眨眼…
(Definition of before you can say Jack Robinson from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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