the done thing
idiomPart ofdone
the done thing — idiom
1. the behaviour that is socially correct or expected according to the customs of a
1.idiom
Definition
the behaviour that is socially correct or expected according to the customs of a particular group or situation.
Example
In Japanese culture, it is the done thing to bow when greeting someone older than you.
Bringing a small gift when you visit someone's home for dinner is the done thing in many countries.