To engage in shoulder surfing.

To disrespect someone, especially by ignoring them.

plural of cold shoulder

(idiomatic) A deliberate act of disrespect; a slight or snub

(idiomatic) To deliberately slight or snub someone.

(idiomatic) Someone offering emotional support to another in distress.

(anatomy) The human pectoral girdle, consisting of the collarbones and shoulder blades

plural of shoulder girdle

(Australian rules football) A bump of an opponent, using the side of the body, i.e. roughly the hip through to the upper arm and shoulder; the upper arm is held close against the body. Such a bump is considered fair play unless it is a push in the back or hits the opponent's head (a high contact).

The glenohumeral joint.