I’m telling you

(also I'll tell you)

Definition

› 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)

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I stand corrected idiom
I wouldn’t put it past someone (to do something) idiom
I’d
I’ll
I’m
I’m telling you idiom
I’ve
(I) beg your pardon idiom
(I) tell you what idiom
i.e.
iambic pentameter noun

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