knock down
definitions
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to cause someone or something to fall to the groundzh: 使某人或某物摔倒在地
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to reduce the price of somethingzh: 降低某物的价格
examples
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The strong wind knocked down the old tree.
强风把老树吹倒了。
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The store knocked down the price of the laptop.
商店降低了笔记本电脑的价格。