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"rough cabin," 1820, from Canadian French chantier "lumberjack's headquarters," in French, "timberyard, dock," from Old French chantier "gantry," from Latin cantherius "rafter, frame" (see gantry). Shanty Irish in reference to the Irish underclass in the U.S., is from 1928 (title of a book by Jim Tully).
"sea song," 1867, alternative spelling of chanty (n.).
[origin uncertain; perhaps fr Irish sean-tig, ''old house''; perhaps fr Canadian French chantier, although this is more probably a borrowing of shanty]