blinker

Short definition from Wiktionary

Noun

1. 1
   Anything that blinks.
2. 2
   The turn signal of an automobile.
3. 3
   A shield attached to the bridle of a horse or other domesticated animal to prevent it from seeing things behind it and to its side.
4. 4
   Whatever obstructs sight or discernment.
5. 5
   The eyelid.
6. 6
   A black eye.
7. 7
   In Conway's Game of Life, an arrangement of three cells in a row that switches between horizontal and vertical orientations in each generation.
8. 8
   A situation where the light of a dab pen or vape starts blinking, which happens when the user takes an extremely long hit.

Verb

1. 1
   To put blinkers on.