verb (used with object), verb (used without object)
to make or become wide or wider; broaden; expand.

1600–10; wide + -en1

widener, noun
rewiden, verb
unwidened, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
widen (ˈwaɪdən)
to make or become wide or wider

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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Example sentences
The studies widen our view of these birds, which evade enemies with apparent
Rather than continuing to widen, as it would if its motion was being driven by
  suction, the new ocean started to shrink.
The meandering path continues to widen the valley floor as falling sediment
  forever alters the course and builds up a river plain.
One sensor will measure stress that could widen the crack.
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