Definition of “cost sb dear” - English Dictionary

british dictionary

“cost sb dear” in British English

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cost sb dear

UK to cause someone to spend a lot of money or lose money:

Buying that second-hand car without having it checked by a mechanic first cost us dear.

UK to cause someone a lot of problems:

Later that year he attacked a photographer, an incident that cost him dear.

(Definition of “cost sb dear” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)