knock off
1.撞倒;打掉
The little girl knocked the glass off by accident.
小女孩不小心碰落了玻璃杯.
2.减去
They knocked off five dollars from the price.
他们把价格降低了五美元.
3.停止;歇工
Let's knock off now.
4.仿制品
She knows the place to go for quality knockoffs .
她知道去哪里买高级的“名牌”仿制服装