part of the furniture

US /pɑːrt əv ðə ˈfɜːrnɪtʃər/
UK /pɑːrt əv ðə ˈfɜːrnɪtʃər/
"part of the furniture" picture
1.

老員工, 擺設

a person or thing that has been in a place or situation for so long that they are considered a permanent, unremarkable, or indispensable feature of it

:
After working here for twenty years, John has become part of the furniture.
在這裡工作了二十年後,約翰已經成了老員工
The old clock in the corner has been there so long it's just part of the furniture.
角落裡的那座老鐘在那裡放了太久,已經成了擺設