A tool or person that rims something, such as a tool used to curl or finish the edge of an object; also a cricket term for a batter who hits along the rim of the bat.
From 'rim' (the edge of something circular) plus the agent suffix '-er' meaning 'one who does.' The root 'rim' comes from Old English 'rima' meaning a space or edge.
The suffix '-er' is one of English's most productive tools—we keep creating new words by adding it to any verb: 'cook' becomes 'cooker,' 'teach' becomes 'teacher,' letting language naturally adapt to describe new jobs and tools.
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