Green’s Dictionary of Slang

deckhand n.

(US) a menial labourer, a domestic servant.

[US]A.H. Lewis Boss 199: Th’ Chief of Tammany don’t deal with deck hands.
[US]J.M. Sullivan Criminal Sl.
[US]J.J. Finerty Criminalese.
[US]Howsley Argot: Dict. of Und. Sl.
[US]Monteleone Criminal Sl. (rev. edn).
[US]Goldin et al. DAUL 57/1: Deck-hand. A domestic servant, especially a cook or scullery maid.