blinker (n.)youdaoicibaDictYouDict
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.
blinkered (adj.)youdaoicibaDictYouDict
in the figurative sense, 1867, from horses wearing blinkers to limit the range of their vision (see blinker).
clinker (n.)youdaoicibaDictYouDict
"mass of slag," 1769, from klincard (1640s), a type of paving brick made in Holland, from Dutch klinkaerd, from klinken "to ring" (as it does when struck), of imitative origin. Also "a clinch-nail;" hence clinker-built (1769). The meaning "stupid mistake" is first recorded 1950 in American English; originally (1942) "a wrong note in music."