Meaning of “before you can say Jack Robinson” in the English Dictionary

british dictionary

"before you can say Jack Robinson" in British English

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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.

(Definition of “before you can say Jack Robinson” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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