tallywoman

noun3

1. •
   (Ireland) A female counting agent.
2. •
   A woman who conducts the tally trade.
3. •
   (informal, no longer used) A woman who cohabits (with someone) outside of marriage.

   • It is used in Yorkshire, Lancashire, Cheshire, and, I dare say, various other counties. A tally-woman is the mistress of a married man, who is said to live tally with her. — 1890