eager beaverEnglishOxford New American Dictionaryeager beaver /ˈˌēɡər ˈbēvər, ˈˌiɡər ˈbivər / ▸ noun informal a keen and enthusiastic person who works very hard.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
EnglishOxford New American Dictionary