A device attached to the breech of a firearm, to guide the eye, in conjunction with the front sight, in taking aim. [1913 Webster]

at first sight, battle sight, bear's breech, breech, breech action, breech birth, breech closer, breech delivery, breech pin, breech presentation, breech screw, frank breech, frank breech delivery, in plain sight, in sight, keep in sight, line of sight, lose sight of, not by a blame sight, not by a long sight, open sight, out of sight, panoramic sight, peep sight, second sight, sight, sight bill, sight draft, sight gag, sight see, telescope sight, telescopic sight