shirk (v.) Look up shirk at Dictionary.com
1630s, "to practice fraud or trickery," also a noun (1630s, now obs.) "a disreputable parasite," perhaps from German schurke "scoundrel, rogue, knave, villain" (see shark). Sense of "evade one's work or duty" first recorded 1785, originally in slang. Related: Shirked; shirking.