Learn what "i'm telling you" means, when people say it, and how to use it naturally in English.

It means the speaker is stressing that this is the full story and there is nothing more to add.
From Undercovered Heart, Episode 22
Someone insists that their explanation is complete and adds one more detail about the phone going dead.
Use this when you want to insist that your explanation is complete. It can sound defensive or impatient in an argument.
Scenes unlock real expressions as you watch
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