Someone who is very eager, enthusiastic, or overly keen to please; often used to describe someone who tries too hard or is overly eager.
From 'keen' (eager, sharp), which comes from Old English 'cene' meaning brave or fierce. The comparative form 'keener' developed to describe someone who is more keen than others.
In Canadian and Australian slang, 'keener' (or 'keen bean') became a social marker—a term for that person who does extra homework or raises their hand constantly. It reveals how language labels social behaviors that every culture recognizes but names differently.
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