blinker (n.)youdaoicibaDictYouDict[blinker 词源字典]
1630s, "one who blinks," agent noun from blink (v.). As a type of horse eye screen to keep the animal looking straight ahead, from 1789. Slang meaning "the eye" is from 1816. Meaning "intermittent flashing light" is from 1923.[blinker etymology, blinker origin, 英语词源]