1 [intransitive and transitive]
to hang or bend down, or to make something do this:
The plant needs some water - it's starting to droop.
His eyelids began to droop (=close, because he was sleepy).
Jessie drooped her head.
to become sad or weak:
Our spirits drooped as we faced the long trip home.
—droop noun [singular]
a droopy moustache