Meaning of I'm telling you In English

• 0 used to emphasize that what you are saying is true, and should be believed:

  • I'm telling you, he's the best player in the American League.

  • We’ve been waiting a long time for this, I’ll tell you.

• 1 believe me when I say this:

  • I'm telling you, he's the best player in the American League.

  • We’ve been waiting a long time for this, I’ll tell you.