Part of speech: Verb
hang loosely or laxly
Example: His tongue lolled
Categories: Dangle, Swing, Drop
The word "droop" comes from Proto-Indo-European *dʰrewb-. It started in Proto-Germanic *drūpaną. Then it appeared in Old Norse drúpa. Later, people used it in Middle English droupen.
A word passing through this many languages survived because it named something universally important.