have something on good authority
成語所屬單字authority
have something on good authority — 慣用語
1. to feel sure that a piece of news is true because it came from a person you trus
1.慣用語
釋義
有可靠消息來源；聽可靠的人說
to feel sure that a piece of news is true because it came from a person you trust, often someone close to the events.
例句
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.