Meaning of mainstay

main•stay

Pronunciation: (mān'stā"), [key]

— n.

the stay that secures the mainmast forward.
a person or thing that acts as a chief support or part: Coffee is the mainstay of the country's economy.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

See also:

mainstay (Thesaurus)

mainspring main stem

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