verb (used without object), verb (used with object)
to become or make broad.

1720–30; broad + -en1

overbroaden, verb
rebroaden, verb
unbroadened, adjective

extend, expand, enlarge, widen; enlighten, inform, educate; sophisticate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
broaden (ˈbrɔːdən)
to make or become broad or broader; widen

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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Word Origin & History

1727, from broad + -en (1). The word seems no older than this date (discovered by Johnson in one of Thomson's season poems); broadened also is first found in the same poet, and pp. adj. broadening is recorded from 1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
However, interest from contemporary movie stars broadened the appeal of the car
  beyond that of a racing vehicle.
The project has since grown and its scope has been broadened.
But evolutionary theory has broadened and changed as his ideas have been melded
  with genetics.
The effort broadened to include nearly every scientific discipline from
  archeology to zoology.
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