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

 

mainstay

 noun
noun
BrE BrE//ˈmeɪnsteɪ//
 
; NAmE NAmE//ˈmeɪnsteɪ//
 
 
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[usually singular] mainstay (of something) a person or thing that is the most important part of something and enables it to exist or be successful He is the mainstay of our theatre group. Cocoa is the country's economic mainstay. Love songs form the mainstay of his act.
See the Oxford Advanced American Dictionary entry: mainstay