mainstay definition, meaning - what is mainstay in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “mainstay”

mainstay

noun uk   us   /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.
(Definition of mainstay from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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