before you can say knife

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.

before you can say knife

very quickly; almost instantaneously. informal
See also: before, can, knife, say
Farlex Partner Idioms Dictionary
See also:
  • before you can say "knife"
  • I'd say
  • say cheese
  • Say cheese!
  • say when
  • out loud
  • say (one's) piece
  • say your piece
  • say piece
  • say again