mainstay

[ meyn-stey ]
/ ˈmeɪnˌsteɪ /

noun

Nautical. 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.

Origin of mainstay

First recorded in 1475–85; main1 + stay2

Example sentences from the Web for mainstay

British Dictionary definitions for mainstay

mainstay
/ (ˈmeɪnˌsteɪ) /

noun

nautical the forestay that braces the mainmast
a chief support