(informal) A minor automobile accident in which contact is made between the front of one vehicle and the rear of another.

plural of rear end

plural of rear admiral

(military) The rear rank of a body of troops when faced about and standing in that position.

plural of rear front

plural of rear projection

plural of rear-ender

plural of pain in the rear

(of a quadruped, usually a horse) To stand on two rear legs, as an aggressive or fearful gesture.

A mirror inside a vehicle that allows the driver to see the traffic behind. / (figuratively, by extension) The observer's perception of something that is past or has been surpassed.