Emily Dickinson Lexicon

DROOP, v.i. [Sax. drepan; Ice. driupa. This word is probably from the root of the L. torpeo, the letters being transposed; or from the root of drop, D. druipen, to drip, drop or droop. Indeed all may be of one family.]

1. To sink or hang down; to lean downward, as a body that is weak or languishing. Plants droop for want of moisture; the human body droops in old age or infirmity.
2. To languish from grief or other cause. – Sandys.
3. To fail or sink; to decline; as, the courage or the spirits droop.
4. To faint; to grow weak; to be dispirited; as, the soldiers droop from fatigue.