Webster's Revised Unabridged Dictionary · 1913

Droop

Droop (drop) , intransitive verb

[Icelandic drūpa; akin to English 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. — Tennyson
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. — Tennyson

Droop , transitive verb

To let droop or sink. [Rare] — M. Arnold
Like to a withered vine That droops his sapless branches to the ground. — Shakespeare

Droop , noun

A drooping; as, a droop of the eye.