office wife
n.— «“I’m not very much pleased with the way you and Ted Jones and Jim Farrel cut up. They call you ‘our office wife’ and act as if they had known you all their lives.” “Office wife?” repeated Helen, “well what of it? Every modern girl laughs at that. Haven’t you a spark of humor?”» —“Fifty-Fifty” by Faye Stevenson Lincoln State Journal (Neb.) July 30, 1923. (source: Double-Tongued Dictionary)