Meaning of “knock the bottom out of sth” in the English Dictionary

british dictionary

"knock the bottom out of sth" in British English

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knock the bottom out of sth

to damage something severely, especially by destroying its support:

The rise in mortgage rates really knocked the bottom out of the housing market.

(Definition of “knock the bottom out of sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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