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cuss(v.) 1815, "to say bad words, use profane language," a vulgar pronunciation ofcurse(v.). The transitive sense of "to curse, swear at" is by 1838. Related:Cussed;cussing. Tocuss (someone) outis attested by 1881. The loss of-r-before-s-is not uncommon: Comparearse/ass(n.2)...