(intransitive, military) Of a soldier at drill, to place a rifle on the right shoulder, with the forearm parallel to the ground and the hand holding the butt.

(intransitive, Canada, US) To look backwards over one's shoulder while driving or biking, before changing lanes or making a turn, to see if any vehicles are in one's blind spots.

(Canada, US) An instance of looking backwards over one's shoulder while driving or biking, before changing lanes or making a turn, to see if any vehicles are in one's blind spots.

A verge to the side of a highway, which should be used only in case of an emergency (especially on a motorway)

(chiefly computer security) The use of direct observation, such as looking over someone's shoulder at an ATM, in order to obtain information.

(of a garment) Not covering the shoulders.

Having a rounded upper back, and shoulders that bend forward.

(travel industry) The time between high and low season in a travel market, or, if the market is divided into four segments, the time just below high season.

Someone who engages in shoulder surfing.

plural of shoulder surfer