knock the props (out) from under (someone or something)

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knock the props (out) from under (someone or something)

1. To undermine, weaken, or destroy something. The stock market crash knocked the props out from under a huge number of investment firms across the nation. Tom knocked the props from under 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 props from under Sarah. I hope she comes out of this funk soon. Don't let the boss's comments knock the props out from under you. He's hard on everyone.
See also: knock, props

knock the props out from under someone

Fig. to destroy someone's emotional, financial, or moral underpinnings; to destroy someone's confidence. When you told Sally that she was due to be fired, you really knocked the props out from under her.
See also: knock, out, props
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