What does お馴染み mean in Japanese?

familiar, well-known, regular (e.g. customer), favourite, favorite, old acquaintance

お馴染み (Onajimi) — familiar · Japanese Dictionary

おなじみ

Onajimi

Usually written in kana.

Other forms: 御馴染み、同じみ

お馴染み (Onajimi) is a Japanese adjectival noun meaning “familiar, well-known, regular (e.g. customer), favourite”.

adjectival nounfamiliar; well-known; regular (e.g. customer); favourite; favorite
nounold acquaintance; old friend; (a) regular; regular customer

Sentences from Tatoeba (CC BY 2.0 FR).