Green’s Dictionary of Slang

closh n.

[common Du. proper name Klaas, itself abbr. of Nicolaas]

a Dutch seaman.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.