fellow servant

noun

(under the fellow-servant rule) an employee working with another employee for the same employer.

Origin of fellow servant

First recorded in 1525–35

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

He had commenced his speculations with twenty, borrowed from a fellow-servant.
Burlesques
William Makepeace Thackeray
She arrived in time to hear his menace to her fellow-servant.
Ernest Maltravers, Complete
Edward Bulwer-Lytton
How long has your fellow-servant—Peggy, I think, you call her—been here?
The Black Baronet; or, The Chronicles Of Ballytrain
William Carleton
John, assisted by his fellow-servant, raised and carried her down stairs.
Charlotte Temple
Susanna Rowson
I don't blame your fellow-servant—I blame nobody but Mrs. Lecount.
No Name
Wilkie Collins