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One that is exceptionally, often excessively industrious or zealous: "The eager beavers of industry seldom reach their potential, much less rise to the top" (Newsweek).
informal a person who displays conspicuous diligence, esp one who volunteers for extra work
a person who is very diligent or zealous.
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|Noun||1.||eager beaver - an alert and energetic person |
doer, actor, worker - a person who acts and gets things done; "he's a principal actor in this affair"; "when you want something done get a doer"; "he's a miracle worker"