have something on good authority
idiomPart ofauthority
have something on good authority — idiom
1. to feel sure that a piece of news is true because it came from a person you trus
1.idiom
Definition
to feel sure that a piece of news is true because it came from a person you trust, often someone close to the events.
Example
I have it on good authority that the bakery will reopen in May.
Lena has it on good authority that the new manager used to teach high school maths.