I can tell you

I can tell you

Used to emphasize a statement. There's going to be trouble in the city if our team loses this championship, I can tell you. I can tell you, I've never seen a rat this big in my whole life!
See also: can, tell
Farlex Dictionary of Idioms.
See also:
  • lemme
  • let me tell you
  • tell the truth and shame the devil
  • tell (one) about (someone or something)
  • tell about
  • tell
  • report
  • phone up
  • tell one to face
  • going to tell