blinker

US /ˈblɪŋ.kɚ/
UK /ˈblɪŋ.kɚ/
"blinker" picture
1.

a light on a vehicle that flashes to show which way the vehicle is going to turn

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He forgot to put on his blinker before turning right.
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The car's left blinker is not working.
:
turn signalindicator
2.

a device, typically a pair of leather flaps, placed on either side of a horse's eyes to prevent it from seeing sideways

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The horse wore blinkers to keep its focus forward.
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Some trainers use blinkers to prevent horses from being distracted during races.
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blindereye flap