on one's own authority

idiom

Definition of on one's own authority

: with the power or right (to do something) "Who gave him the authority to do this?" "He didn't do it on his own authority

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“On one's own authority.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20own%20authority. Accessed 26 Nov. 2020.

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