English

Definition of eager beaver noun from the Oxford Advanced Learner's Dictionary

 

eager beaver

 noun
noun
BrE BrE//ˌiːɡə ˈbiːvə(r)//
 
; NAmE NAmE//ˌiːɡər ˈbiːvər//
 
(informal)
 
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an enthusiastic person who works very hard
See the Oxford Advanced American Dictionary entry: eager beaver