chaperon/ˈʃæpərəun; `ʃæpəˌron/ n(esp formerly) older person, usu a woman, who looks after a girl or a young unmarried woman on social occasions （尤指旧时）在社交场合照顾少女或未婚女子的年长者（通常为妇女）; 年长女伴; 保护人. chaperon, v [Tn]act as a chaperon for (sb) 当（某人的）年长女伴.
牛津英汉双解词典