broaden

[brawd-n]
verb (used without object), verb (used with object)
to become or make broad.

Origin:
1720–30; broad + -en1

overbroaden, verb
rebroaden, verb
unbroadened, adjective


extend, expand, enlarge, widen; enlighten, inform, educate; sophisticate.
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World English Dictionary
broaden (ˈbrɔːdən)
 
vb
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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Etymonline
Word Origin & History

broaden
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
Introducing livestock to its range is guaranteed to broaden its diet even
  further.
Any theoretical statistician who thinks that this sort of feedback system does
  not work needs to broaden their horizons a bit.
Remember, when you consider evolution you have to broaden your time horizon.
It's pretty clear that its focus on global economics has done a lot to broaden
  its philosophy.
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