Definition
Used to tell someone to stop doing something annoying.
停止！(非正式)
"Knock it off!" Mom said to the noisy children.
“别闹了！”妈妈对吵闹的孩子们说。
If you keep tapping on the table like that, I'm going to tell you to knock it off.
如果你继续那样敲桌子，我就要叫你別闹了。
They were telling jokes to each other during the meeting until the boss told them to knock it off.
他们在会议期间互相讲笑话，直到老板叫他们別闹了。