/ druːp; NAmE / verb [ v ]
1.
to bend, hang or move downwards, especially because of being weak or tired :
She was so tired, her eyelids were beginning to droop.
2.
to become sad or depressed :
Our spirits drooped when we heard the news.
► droop noun [ sing. ]:
the slight droop of her mouth
► droopy adjective :
a droopy moustache
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WORD ORIGIN
Middle English : from Old Norse drúpa hang the head; related to drip and drop .