the upper joint of each of a person's arms and the part of the body between this and the neck

I was carrying a bag over my shoulder

she turned to look at him over her shoulder

he tapped me on the shoulder and I looked round

a part of something resembling a shoulder in shape, position, or function

the shoulder of a pulley

put (something heavy) over one's shoulder or shoulders to carry

we shouldered our crippling backpacks and set off slowly up the hill

push (someone or something) out of one's way with one's shoulder

she shouldered him brusquely aside