before somebody can say Jack Robinson
(faster|quicker) than {sb} (can|could) say Jack Robinson

英語での「before somebody can say Jack Robinson」の定義と意味

before somebody can say jack robinson
01

so suddenly or quickly that leaves one with no time to react or notice anything

before {sb} (can|could) say Jack Robinson definition and meaning
humorous
idiom
informal
Before I could say Jack Robinson, the dog had grabbed the sandwich and run off.
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