Definition of mainstay in English:

mainstay

Syllabification: main·stay
Pronunciation: /ˈmānˌstā
 
/

noun

1A stay that extends from the maintop to the foot of the foremast of a sailing ship.
2A thing on which something else is based or depends: farming is the mainstay of the rural economy
More example sentences
  • The gun run, loosely based on the exploits of Naval squads in the Boer War, was a mainstay of the Royal Tournament.
  • The first pick of Fox's second draft was Jordan Gross, who has become a mainstay at right tackle.
  • Since I have so much yew foliage, this is the mainstay of the ropes and swags that I will be creating.
Synonyms
central component, central figure, centerpiece, prop, linchpin, cornerstone, pillar, bulwark, buttress, chief support, backbone, anchor, foundation, base, staple

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