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One way Chekov used the term was to describe the Klingons in a negative connotation. He once referred to Korax as a Cossack after Korax noted that Earthers reminded him of Regulan blood worms. (TOS: "The Trouble with Tribbles")
While under the influence of the Beta XII-A entity, Chekov referred to the entire Klingon race as Cossacks as well as "filthy Klingon murderers" for killing his imaginary brother Piotr Chekov. (TOS: "Day of the Dove")