knock the bottom out
knock the bottom out of (someone or something)
1. To undermine, weaken, or destroy something. The stock market crash knocked the bottom out of dozens of investment firms around the country. Tom's comments really knocked the bottom out of our proposal during the meeting.
2. To erode or undermine someone's self-confidence or sense of self-worth. Losing her job really knocked the bottom out of Sarah. I hope she comes out of this funk soon. Don't let boss's comments knock the bottom out of you. He's hard on everyone.
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.