Definition
To act without asking permission or seeking approval, often in a way that is considered rude or disrespectful.
未经许可
She took my jacket without so much as a by-your-leave, not even a word.
她连一句话都没说，就擅自拿走了我的夹克。
They started using our facilities without so much as a by-your-leave, which was completely unacceptable.
他们未经任何许可就开始使用我们的设施，这完全无法接受。
He walked into my office without so much as a by-your-leave and started going through my files.
他未经许可就走进我的办公室，开始翻阅我的文件。