I have never heard the word dime used that way, nor do I see anything in the first few google results about it being used that way. There was a 60s slang term

I have never heard the word dime used that way, nor do I see anything in the first few google results about it being used that way. There was a 60s slang term "drop a dime" which meant to call someone, and nowadays that phrase means to call the cops or to snitch.