Argumentum ad Verecundiam
The Latin word verecundia means modesty or shyness, and argumentum ad vercundiam means literally 'argument towards modesty', though the phrase is normally rendered in English as Argument from Authority
The expression was invented by John Locke, who explained the meaning of the term as follows: "When men are established in any kind of dignity, it is thought a breach of 'modesty' for others to derogate any way from it, and question the authority of men who are in possession of it."
Dignity and Modesty.....