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English definition of “must-have”


adjective [before noun]    
a must-have product is a fashionable one that a lot of people want to own: a must-have accessory/gadget/item The device soon became a must-have accessory for anyone in the business world.
(Definition of must-have adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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willing to give money, help, kindness, etc., especially more than is usual or expected

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