/ˈʌndər ɔːˈθɒrəti ʌv/ – Phrase
Definition: do, vì, căn cứ vào.
A more thorough explanation: “Under authority of” refers to acting or performing a task with the legal permission, approval, or direction of someone in a position of power or authority.
Example: The contract was signed under authority of the company’s board of directors.