Definition of mainstay in English:

mainstay

Line breaks: main|stay
Pronunciation: /ˈmeɪnsteɪ
 
/

noun

1A stay which extends from the maintop to the foot of the foremast of a sailing ship.
1.1Someone or something on which something else is based or relies: whitefish are the mainstay of the local industry
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, centrepiece, prop, linchpin, cornerstone, pillar, bulwark, buttress, chief support, backbone, anchor, foundation, base, bastiontower of strength, key player, sinew, right-hand man/woman, right arm, Atlas

Definition of mainstay in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something