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English definition of “costly”

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costly

adjective  /ˈkɔs·tli/ us  

costly adjective (MAKING YOU SPEND MONEY)

expensive: This procedure can be very costly.

costly adjective (MAKING YOU GIVE OR LOSE SOMETHING)

done by making you give or lose something of value: Her costly mistake allowed the opponents to score.
(Definition of costly from the Cambridge Academic Content Dictionary © Cambridge University Press)
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