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English definition of “mainstay”

mainstay

noun     /ˈmeɪn.steɪ/
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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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