Green’s Dictionary of Slang

a worn-out or semi-retired prostitute who runs errands in a tavern, either bringing drinks or providing customers with her more alluring peers.

c.1698		B.E. Dict. Canting Crew n.p.: Pitcher-bawd the poor Hack that runs of Errands to fetch Wenches or Liquor.
1725		New Canting Dict. [as cit. c.1698].