knock-down

1. PHRASAL VERB To knock down a building or part of a building means to demolish it. 拆掉 (建筑物等)

Why doesn't he just knock the wall down?

他為什么不索性把墻拆掉？

2. PHRASAL VERB If someone is knocked down or is knocked over by a vehicle or its driver, they are hit by a car and fall to the ground, and are often injured or killed. (開車) 撞倒[英國英語]

He died after being knocked down by a car. 他被一輛汽車撞倒后死了。

A drunk driver knocked down and killed two girls. 一個喝醉了酒的司機撞死了兩個女孩子。

A car knocked him over. 一輛汽車把他撞倒了。

3. PHRASAL VERB To knock down a price or amount means to decrease it. 降低 (價格)[美國英語]

The market might abandon the stock, and knock down its price. 商場可能會清理庫存，降低價格。