Something that discourages or prevents a particular action through fear of consequences; a thing that makes someone less likely to do something.
From Latin 'deterrere,' meaning 'to frighten away,' combining 'de-' (away) and 'terrere' (to frighten). The word developed from the concept of frightening someone away from an action, entering English in the 19th century.
Think of deterrent as 'de-terror-ent'—it uses terror (fear) to keep people away from doing something! Like a scarecrow deters birds, a deterrent scares away unwanted behavior. The key is prevention through fear of consequences.
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