vt to let droop or sink.
2. droop ·noun a drooping; as, a droop of the eye.
3. droop ·vi to proceed downward, or toward a close; to decline.
4. droop ·vi 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.
5. droop ·vi to grow weak or faint with disappointment, grief, or like causes; to be dispirited or depressed; to languish; as, her spirits drooped.