The phrase "has on good authority" is an idiomatic expression used to convey that the information or statement being made is reliable, trustworthy, and credible due to its source. Generally, it signifies that the individual sharing the information has obtained it from a reputable or authoritative source, lending it strong credibility.
When someone claims to have information "on good authority," it implies that the knowledge or facts they possess have been acquired from someone who is knowledgeable, credible, or in a position of expertise. This could be an expert in a particular field, a reliable source, a reputable publication, or someone with first-hand experience or inside information. The expression suggests that the source possesses reliable information, which in turn increases the authenticity and accuracy of the information being shared.
The phrase is commonly used in both formal and informal contexts, such as news reporting, academic writing, conversations, or simply when relaying information to others. It serves to assure the listener or reader that the information presented is not mere speculation or gossip, but rather derived from a reliable source. By using the expression "has on good authority," the individual intends to establish trustworthiness and engender confidence in the veracity of the information being communicated.