part of the furniture

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

老员工, 摆设

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.
在这里工作了二十年后,约翰已经成了老员工
The old clock in the corner has been there so long it's just part of the furniture.
角落里的那座老钟在那里放了太久,已经成了摆设