back office

WordReference Random House Unabridged Dictionary of American English © 2025

back′ of′fice, 

1. Stock Exchange any department or office, as a private office or a department of record keeping, that is not usually seen by outsiders.

Collins Concise English Dictionary © HarperCollins Publishers::

back office noun

1. the administrative and support staff of a financial institution or other business
2. (as modifier): back-office operations