A blinker can refer to several different things:
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In the context of horse tack, blinkers, also known as blinders, are a piece of equipment that prevent the horse from seeing to the rear and, in some cases, to the side. They are usually made of leather or plastic cups placed on either side of a horses eyes, attached to a bridle or an independent hood. Blinkers are used to keep horses focused on what is in front of them, encouraging them to pay attention to the race rather than to distractions such as crowds. They are commonly used in racing and driving horses to prevent them from being distracted or spooked, especially on crowded city streets).
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In the context of vaping, a "blinker" refers to a long, uninterrupted inhalation from a vape pen that lasts until the pen’s battery light starts blinking, indicating the device’s automatic cut-off point. This type of hit is often associated with a more potent, rapid-onset high due to the large quantity of vapor inhaled.
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A blinker can also refer to a flashing light, usually used to signal a turn on a car. Before making a turn, drivers are advised to use their blinker to indicate their intentions to other drivers.
In summary, a blinker can refer to horse tack used to limit a horses vision, a long inhalation from a vape pen, or a flashing turn signal on a car.