A person or thing that makes clattering sounds; something that produces loud, repeated rattling noises.
From clatter (imitative origin) plus the agent suffix -er, meaning 'one who clatters' or 'that which clatters.'
In old mills and factories, machinery operators were sometimes called 'clatterers' because the whole operation was dominated by the endless noise they created—now that word is almost forgotten, replaced by more specific machine names.
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