Source : Webster's Revised Unabridged Dictionary (1913)

Troop \Troop\, v. i. [imp. & p. p. {Trooped}; p. pr. & vb. n.
   {Trooping}.]
   1. To move in numbers; to come or gather in crowds or troops.
      ``Armies . . . troop to their standard.'' --Milton.

   2. To march on; to go forward in haste.

            Nor do I, as an enemy to peace, Troop in the throngs
            of military men.                      --Shak.