Meaning of “I'm telling you” in the English Dictionary

american-english dictionary

"I'm telling you" in British English

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I'm telling you

also I tell you, I can tell you

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.

(Definition of “I'm telling you” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"I’m telling you" in American English

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I’m telling you

also I'll tell you

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.
Note: Used to emphasize what you are saying.

(Definition of “I’m telling you” from the Cambridge Academic Content Dictionary © Cambridge University Press)