MAINSTAY Meaning of MAINSTAY in English transcription, транскрипция: [ ˈmeɪnsteɪ ]n. 1 a chief support (has been his mainstay since his trouble). 2 Naut. a stay from the maintop to the foot of the foremast. English main colloquial, spoken dictionary. Английский основной разговорный словарь. 2012