afterguardsman means A member of the afterguard on a sailing ship. Lexicurio rates it Sui generis — a strength score of 85 out of 100.
Etymology
From afterguard + -s- + -man.
noun
- A member of the afterguard on a sailing ship“1924, Herman Melville, Billy Budd, London: Constable & Co., Chapter 12, http://gutenberg.net.au/ebooks06/0608511h.html
"I found an afterguardsman in our part of the ship here and I bid him be off where he belongs."”