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knock the bottom out

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knock the bottom out

 (of something)

1. and knock the bottom out Lit. to break the bottom of a container. I knocked the bottom out of the barrel and used it to store compost. Knock out the bottom and set it right on the soil.

2. Fig. [for something] to go down so low as to knock out the bottom. The bad news knocked the bottom out of the stock market. The recession knocked the bottom out of our profits.

See also: bottom, knock, out