eager beaver

[ee-ger]

eager beaver

[ee-ger]
noun
a person who is excessively diligent or overly zealous.

Origin:
1940–45, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Eager beaver is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
eager beaver
 
n
informal a person who displays conspicuous diligence, esp one who volunteers for extra work

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

eager beaver

An exceptionally zealous person, one who habitually takes on more tasks or works harder than others. For example, Bill is a real eager beaver, always volunteering to stay late. This expression became especially popular during World War II, applied to recruits anxious to impress their commanding officers by such behavior. [First half of 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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