mainstay
noun/ˈmeɪnsteɪ/
/ˈmeɪnsteɪ/
[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
- 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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mainstay