part of the furniture
US /pɑːrt əv ðə ˈfɜːrnɪtʃər/
UK /pɑːrt əv ðə ˈfɜːrnɪtʃər/

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。