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English definition of “mainstay”

mainstay

noun uk   /ˈmeɪn.steɪ/ us  
the mainstay of sth the most important part of something, providing support for everything else: Cattle farming is the mainstay of the country's economy. The white blouse will be the mainstay of your wardrobe this summer.Important and essential thingsInformation and messages
(Definition of mainstay from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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