vi.
(因虚弱、疲乏或支持不住而)下垂，低垂，下弯，下陷，(眼睛)朝下：
The branches of the tree drooped after the heavy rain.
大雨过后树枝低垂。
(身体)变衰弱、变疲乏、(健康)衰退；丧失活力：
His head drooped sadly.
他悲哀地垂着头。
His thoughts drooped with fatigue.
他的思维由于疲乏而丧失了活力。
(人的精神)沮丧，忧郁；(意志)消沉：
Don't let your spirits