I'm telling you Meaning in the Cambridge English Dictionary
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Meaning of “I'm telling you” in the 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 ​bestplayer in the American League. We’ve been ​waiting a ​longtime 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 ​bestplayer in the American ​League. We’ve been ​waiting a ​longtime 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)
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