Meaning of “at the expense of sth” in the English Dictionary

british dictionary

"at the expense of sth" in British English

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at the expense of sth

C1 If you do one thing at the expense of another, doing the first thing harms the second thing:

He had no need to protect their reputation at the expense of his own.

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