before you know it

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before you know it

Quickly or suddenly. I'm not far from your house, so I'll be there before you know it. Before you know it, you'll be graduating, so start thinking about your future now.
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before you know it

almost immediately. I'll be there before you know it. If you keep spending money like that, you'll be broke before you know it.
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before you know it

See also: before, know