old boy

Từ điển Oxford Advanced Learner 8th

▪ I. old boy [old boy] noun
1. ˈold boyBrE NAmE (BrE)a man who used to be a student at a particular school, usually a private one
•They're having an old boys' reunion next month.
2. ˌold ˈboyBrE NAmE (informal, especially BrE)an old man
•The old boy next door has died.
see also ↑old girl
Idiom: ↑old boy network
 
▪ II. old ˈboy, ˈchap, ˈman, etc. idiom
(old-fashioned, BrE, informal)used by older men of the middle and upper classes as a friendly way of addressing another man
Main entry: ↑old_idiom