Have something on good authority positive informal verb phrase
You can use get instead of have without changing the meaning of sentence.
I get it on good authority that the company is going to brankrupt.
I have it on good authority that my neighbor is moving new house because his son told me about it.
We have it on good authority she will be promoted to manager
To decide to believe someone‘s saying although they may not tell the truth
1. If you hang your hat on something, you depend or reply on it.
2. If you hang your hat on something, you believe or trust it.
If you take something as gospel, you definitely believe it without without any hesitation.
To put your trust confidence or hope in somebody or something
The verb "have" should be conjugated in the present simple and past simple. "Something" in the phrase is usually "it", so you can understand this phrase as "have it on good authority"
Used to allude that the last force, problem or burden which is seemingly minor and small causes a person, system or organisation to collapse or fail
Her husband's violent act last night was the straw that broke the donkey's back and she left him