Definition
To act without asking permission or seeking approval, often in a way that is considered rude or disrespectful.
未經許可
She took my jacket without so much as a by-your-leave, not even a word.
她連一句話都沒說，就擅自拿走了我的夾克。
They started using our facilities without so much as a by-your-leave, which was completely unacceptable.
他們未經任何許可就開始使用我們的設施，這完全無法接受。
He walked into my office without so much as a by-your-leave and started going through my files.
他未經許可就走進我的辦公室，開始翻閱我的文件。