Meaning of “cut the ground from under sb's feet” in the English Dictionary

british dictionary

"cut the ground from under sb's feet" in British English

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cut the ground from under sb's feet

UK to make someone or someone's ideas seem less good, especially by doing something before them or better than them

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