before you can say knife

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before you can say "knife"

Very quickly. I'll have the files done before you can say "knife."
See also: before, can, say
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

before you can say knife

very quickly; almost instantaneously. informal
See also: before, can, knife, say
Farlex Partner Idioms Dictionary © Farlex 2017
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