(1):
(v. i.) To proceed downward, or toward a close; to decline.
(2):
(v. i.) To grow weak or faint with disappointment, grief, or like causes; to be dispirited or depressed; to languish; as, her spirits drooped.
(3):
(v. i.) 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.
(4):
(v. t.) To let droop or sink.
(5):
(n.) A drooping; as, a droop of the eye.