mainstay Meaning in the Cambridge English Dictionary
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Meaning of “mainstay” in the English Dictionary

"mainstay" in British English

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mainstaynoun

uk   us   /ˈmeɪn.steɪ/
the mainstay of sth the most ​importantpart of something, ​providingsupport for everything ​else: Cattle ​farming is the mainstay of the country's ​economy. The ​whiteblouse will be the mainstay of ​yourwardrobe this ​summer.
(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 ​importantpart of something, ​providingsupport for everything ​else: In the early 1900s, ​farming was the mainstay of the ​nationaleconomy.
(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   us   /ˈmeɪnsteɪ/
the most important ​part of something, ​providingsupport 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)
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