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.