pull the carpet/rug out from under somebody's feet

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pull the ˌcarpet/ˌrug out from under somebody’s ˈfeet

(informal) take the help, support or confidence away from somebody suddenly: I was just about to ask her out when she pulled the rug out from under my feet by telling me she’s getting married next month.The bank’s pulled the carpet out from under his feet, unfortunately. It looks as if he’ll have to sell the business.
See also: carpet, feet, out, pull, rug