Refers to elite or selective groups where membership is sometimes hard to gain. She finally got to be in the club after years of trying to impress them.
Pro Tip 2/3
Common Interest
Used for groups focused on a shared activity or interest, like sports or hobbies. He's thrilled to be in the club where everyone loves model trains.
Pro Tip 3/3
Not Literal
Sometimes used metaphorically to mean inclusion in informal groups, not an official organization. Ever since she moved downtown, she's been in the club of city commuters.