good authority

1. 1.

   testimony by someone who should know

   “I have it on good authority”

   Broadertestimony

Questions about good authority

What does good authority mean?

good authority means "testimony by someone who should know".

Is good authority a common word?

good authority is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.