A person who chastises or severely criticizes someone.
Formed from 'chastise' (Old French 'chastier') plus the agent suffix '-er,' which creates nouns meaning 'one who does' the action. This follows standard English word formation patterns.
Medieval literature is full of 'chastisers'—from teachers to priests to parents—all believing their harsh criticism was morally necessary, which reveals how different past attitudes were about harsh discipline.
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