A person who chides; someone who scolds or criticizes others.
From 'chide' (Old English cīdan) plus the agent suffix '-er,' which creates a noun meaning 'one who does' the action. This is one of the most productive suffixes in English, creating nouns like 'teacher,' 'runner,' and 'baker' from verbs.
The suffix '-er' is so powerful that English speakers can instantly understand almost any '-er' word they've never heard before—'horse whisperer,' 'dog walker,' 'code breaker'—because we recognize that '-er' means 'someone who does that thing,' making English remarkably creative and flexible.
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