A person or device that curbs or restrains something; something that functions to control or limit.
From 'curb' (to control) plus the agent suffix '-er' (one who does). Follows standard English word formation for creating agent nouns.
Agent nouns with '-er' are so productive in English that we can instantly understand 'curber' even though it's rare—our brains automatically parse it as 'something that curbs,' showing how English word-building follows predictable patterns.
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