noun

• The part of an animal's body between the base of the neck and forearm socket.
• (topography) A shelf between two levels.
  "He stopped the car on the shoulder of the highway to change the flat tire."
• (topography) A shelf between two levels.
  "[…]the north-western shoulder of the mountain[…]"
• (topography) A shelf between two levels.
  "I certainly was not prepared for the cosy nestling valleys that snuggled against the shoulders of the hills; a land where the graystone cottages and farmsteads still prevailed, but where they had taken on something of the softness of their kind in Gloucester and the Cotswolds, and seemed almost like growths of the soil; […]."

verb

• (transitive) To push (a person or thing) using one's shoulder.
  "[…]As they the earth would ſhoulder from her ſeat,[…]"
• (transitive, by extension) To bully, manipulate or pull rank on (somebody).
  "He shouldered me out of my own band."
• (transitive) To put (something) on one's shoulders.
  "Early in the morning they shouldered light packs, took their rifles, crossed the big draw, and entered the timber where was the deadfall."
• (transitive) To place (something) against one's shoulders.
  "All three sets are nicely sculptured along the bottom to prevent interference when shouldering your gun with proper shooting form."