before you can say (something)

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before you can say (something)

Very quickly or suddenly. (The idea being that something will happen so fast that you won't have time to articulate it.) I'm not far from your house, so I'll be there before you can say "when." Default on your mortgage repayments again, and the bank repossess everything you own before you can say, "We're broke!"
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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