mainstay/-steɪ; -ˌste/ n1 rope from the top of the mainmast to the base of the foremast 主桅支索.2 (fig 比喻) chief support(er) 主要的依靠; 支柱 He is the mainstay of our theatre group. 他是我们剧组的台柱.
牛津英汉双解词典