A person or animal that coughs; something that produces coughing sounds.
From English 'cough' (from Middle English, imitative origin) plus the agent suffix '-er,' meaning 'one who does something.'
The word 'cough' is onomatopoeia—it imitates the actual sound, and adding '-er' to any verb to mean 'one who does it' is one of English's most productive patterns!
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