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mainstay

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mainstay/ˈmeɪnˌsteɪ/noun
pluralmainstays
mainstay
/ˈmeɪnˌsteɪ/
noun
pluralmainstays
Learner's definition of MAINSTAY  
[count]
: a very important part of something: something or someone that provides support and makes it possible for something to exist or succeed
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