old girl

Từ điển Oxford Advanced Learner 8th

old girl [old girl] noun
1. ˈold girlBrE NAmE (BrE)a woman who used to be a student at a particular school, usually a private one
•There's going to be an old girls' reunion next month.
2. ˌold ˈgirlBrE NAmE (informal, especially BrE)an old woman
•The old girl next door has died.