before (one) can blink(redirected from before you could blink)
before (one) can blink
Very quickly or suddenly. I'm not far from your house, so I'll be there before you can blink. Before I could blink, a deer darted out in front of my car, and I had to slam on my brakes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.