lone wolf

noun Informal.
a person who prefers to live, act, or work alone or independent of others.

Origin:
1905–10, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lone wolf
 
n
a person who prefers to be alone

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

lone wolf

A person who prefers to do without the company or assistance of others. For example, Her nursery school teacher described Beth as a lone wolf, an assessment her parents found astonishing. This expression alludes to the tendency of some species of wolf to hunt alone rather than in packs. [c. 1900]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Scientific projects are becoming more of a group effort than a lone wolf outing.
Zoo staff immediately made preparations to tranquilize or net this lone wolf
  from the secondary containment area.
Isolated at the center of the canvas, a lone wolf stares with narrowed eyes
  into the viewer's space.
However, this can be difficult to accomplish with a lone wolf that is roaming
  across wide areas.
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