Meaning of “mainstay” in the English Dictionary

british dictionary

"mainstay" in British English

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(Definition of “mainstay” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mainstay" in American English

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mainstaynoun [ C ]

us /ˈmeɪnˌsteɪ/

the most important part of something, providing support for everything else:

In the early 1900s, farming was the mainstay of the national economy.

(Definition of “mainstay” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"mainstay" in Business English

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mainstaynoun [ C, usually singular ]

uk /ˈmeɪnsteɪ/ us

the most important part of something, providing support for everything else:

the mainstay of sth Antibiotic therapy is the mainstay of treatment for many infections.
Cattle farming is the mainstay of the country's economy.

(Definition of “mainstay” from the Cambridge Business English Dictionary © Cambridge University Press)