Someone or something that droops, or a device used to make something hang down.
Formed from 'droop' plus the agent suffix '-er', which creates a noun meaning 'one who does' or 'thing that does' an action. This pattern is centuries old in English.
The '-er' suffix is one of English's most productive word-building tools—you can add it to almost any verb to create a noun for the doer of that action, which is why English has thousands of -er words!
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