Definition
Unacceptable or inappropriate; something that should not occur.
（表示某事不可接受或不应发生）不恰当，不能接受。
They used my design without permission, which is absolutely not on.
他们未经许可使用了我的设计，这绝对不能接受。
You can't treat your colleagues like that; it's just not on.
你不能那样对待你的同事，这完全不恰当。
Playing games during work hours? That's just not on.
在工作时间玩游戏？这完全不能接受。