Meaning of “pull the rug from under sb's feet” in the English Dictionary

british dictionary

"pull the rug from under sb's feet" in British English

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pull the rug from under sb's feet

also pull the rug out from under sb

to suddenly take away help or support from someone, or to suddenly do something that causes many problems for them

(Definition of “pull the rug from under sb's feet” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)