have something on good authority

have it on good authority

To know certain information from a reliable source. I have it on good authority that Mom will take us out for ice cream if you finish your vegetables. Once that witness's story was verified, we had it on good authority that the man we'd arrested had in fact committed the crime.
See also: authority, good, have, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

have something on good authority

If you have something on good authority, you believe it is true because you trust the person who told you about it. I have it on good authority that there's no way this light can cause skin cancer. Note: This expression can be varied, for example by using get or be told instead of have. I'm told on good authority that you will be successful in your examinations.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

have something on good authority

have ascertained something from a reliable source.
Farlex Partner Idioms Dictionary © Farlex 2017

have something on good auˈthority

be able to believe something because you trust the person who gave you the information: I have it on good authority that the chairman is going to resign.
Farlex Partner Idioms Dictionary © Farlex 2017
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