blinker (blin|ker)

noun

• 1 (blinkers) chiefly British a pair of small leather screens attached to a horse’s bridle to prevent it seeing sideways and behind and being startled.
• something which prevents someone from gaining a full understanding of a situation: we are having a fresh look at ourselves without blinkers

• 2 (usually blinkers) a vehicle indicator or other device that gives out an intermittent light: the cars queued up with blinkers flashing

verb

• put blinkers on (a horse): Brown Boy will be blinkered for the first time at York
• cause (someone) to have a narrow or limited outlook on a situation: university education blinkers researchers so that they see poverty in terms of their own specialization