mainstay

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mainstay /ˈmeɪnˌsteɪ/ noun
plural mainstays
mainstay
/ˈmeɪnˌsteɪ/
noun
plural mainstays
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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