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cost an arm and a leg/a small fortune

(UK also cost a bomb/the earth/a packet)

Definition

to be extremely expensive: I'd love to buy a Rolls-Royce, but they cost an arm and a leg.Costs and expensesCosting too muchExpensive and luxurious
(Definition of cost an arm and a leg/a small fortune from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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