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Definition of mainstay noun from the Oxford Advanced Learner's Dictionary

mainstay

noun
 
/ˈmeɪnsteɪ/
 
/ˈmeɪnsteɪ/
[usually singular]
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  1. mainstay (of something) a person or thing that is the most important part of something and enables it to exist or be successful
    • She is the mainstay of our theatre group.
    • Cocoa is the country's economic mainstay.
    • Love songs form the mainstay of his act.
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See mainstay in the Oxford Advanced American DictionarySee mainstay in the Oxford Learner's Dictionary of Academic English
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