A person or thing that bothers, annoys, or troubles someone else.
From the verb 'bother' plus the agent suffix '-er,' which transforms verbs into nouns describing someone who performs the action; formed in English around the 17th-18th centuries as 'bother' gained popularity.
Every language needs a word for 'someone who annoys you,' and English created 'botherer' by simply adding '-er'—it's the same productive pattern that gave us 'runner,' 'teacher,' and 'singer' from verbs!
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