blinker

Noun

• blind consisting of a leather eyepatch sewn to the side of the halter that prevents a horse from seeing something on either side

• a blinking light on a motor vehicle that indicates the direction in which the vehicle is about to turn

• a light that flashes on and off; used as a signal or to send messages

Verb

• put blinders on (a horse)

Related words

• Synonyms: 
  winker , blinder , turn signal , turn indicator , trafficator , flasher