a warning or signalling light that flashes on and off

(in pl) something that restricts understanding or awareness

(in pl) an obstruction to sight or discernment

chiefly Brit either of two flaps, one on each side of a horse's bridle, allowing only frontal vision

to put blinkers on (e.g. a horse)

to restrict or lessen the understanding, discernment, or awareness of (somebody)