droop /ˈdrup/
  (vi.)下垂,消沈(vt.)使下垂低垂,消沈
  Droop v. i. [imp. & p. p. Drooped p. pr. & vb. n. Drooping.]
  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.”
     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.”
  Droop, v. t. To let droop or sink. [R.]
  Like to a withered vine
  That droops his sapless branches to the ground.   --Shak.
  Droop, n. A drooping; as, a droop of the eye.
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  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]