Source : Webster's Revised Unabridged Dictionary (1913)

Shoulder \Shoul"der\, v. t. [imp. & p. p. {Shouldered}; p. pr. &
   vb. n. {Shouldering}.]
   1. To push or thrust with the shoulder; to push with
      violence; to jostle.

            As they the earth would shoulder from her seat.
                                                  --Spenser.

            Around her numberless the rabble flowed, Shouldering
            each other, crowding for a view.      --Rowe.

   2. To take upon the shoulder or shoulders; as, to shoulder a
      basket; hence, to assume the burden or responsibility of;
      as, to shoulder blame; to shoulder a debt.

            As if Hercules Or burly Atlas shouldered up their
            state.                                --Marston.

   {Right shoulder arms} (Mil.), a position in the Manual of
      Arms which the piece is placed on the right shoulder, with
      the lock plate up, and the muzzle elevated and inclined to
      the left, and held as in the illustration.

Shouldered \Shoul"dered\, a.
   Having shoulders; -- used in composition; as, a
   broad-shouldered man. ``He was short-shouldered.'' --Chaucer.

Source : WordNet®

shouldered
     adj : having shoulders or shoulders as specified; usually used as
           a combining form; "stoop-shouldered";
           "broad-shouldered"