collar (n.) Look up collar at Dictionary.com
c.1300, "neck armor, gorget," from Old French coler "neck, collar" (12c., Modern French collier), from Latin collare "necklace, band or chain for the neck," from collum "the neck," from PIE *kwol-o- "neck" (cognates: Old Norse and Middle Dutch hals "neck"), literally "that on which the head turns," from root *kwel- (1) "move round, turn about" (see cycle (n.)). Late 14c. as "border at the neck of a garment."
collar (v.) Look up collar at Dictionary.com
1550s, "to grab (someone) by the collar or neck," from collar (n.). Meaning "to capture" is attested from 1610s. Related: Collared; collaring. As a past participle adjective, collared "wearing a collar" is from late 14c.