mainstayPronunciation: /ˈmeɪnsteɪ/Translate mainstay | into German | into Italian Definition of mainstay noun a stay which extends from the maintop to the foot of the foremast of a sailing ship. someone or something on which something else is based or relies:whitefish are the mainstay of the local industrymainstay in other Oxford dictionaries Definition of mainstay in the US English dictionary
