Source : Webster's Revised Unabridged Dictionary (1913)

Droop \Droop\, v. i. [imp. & p. p. {Drooped}; p. pr. & vb. n.
   {Drooping}.] [Icel. dr?pa; akin to E. drop. See {Drop}.]
   1. To hang bending downward; to sink or hang down, as an
      animal, plant, etc., from physical inability or
      exhaustion, want of nourishment, or the like. ``The purple
      flowers droop.'' ``Above her drooped a lamp.'' --Tennyson.

            I saw him ten days before he died, and observed he
            began very much to droop and languish. --Swift.

   2. To grow weak or faint with disappointment, grief, or like
      causes; to be dispirited or depressed; to languish; as,
      her spirits drooped.

            I'll animate the soldier's drooping courage.
                                                  --Addison.

   3. To proceed downward, or toward a close; to decline. ``Then
      day drooped.'' --Tennyson.

Droop \Droop\, v. t.
   To let droop or sink. [R.] --M. Arnold.

         Like to a withered vine That droops his sapless
         branches to the ground.                  --Shak.

Droop \Droop\, n.
   A drooping; as, a droop of the eye.

Source : WordNet®

droop
     n : a shape that sags; "there was a sag in the chair seat" [syn:
          {sag}]
     v 1: droop, sink, or settle from or as if from pressure or loss
          of tautness [syn: {sag}, {swag}, {flag}]
     2: hang loosely or laxly; "His tongue lolled" [syn: {loll}]
     3: become limp; "The flowers wilted" [syn: {wilt}]