worsen

[wur-suhn]
verb (used with object), verb (used without object)
to make or become worse.

Origin:
1175–1225; Middle English worsenen. See worse, -en1

1. aggravate, annoy, intensify, irritate, worsen (see synonym study at aggravate) ; 2. aggravation, annoyance, intensification, irritation, worsening.


decline, deteriorate, slip, sink.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
worsen (ˈwɜːsən)
 
vb
to grow or cause to grow worse

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

worsen
"to make worse," O.E. wyrsian, from the root of worse (q.v.). The refl. sense of "to get worse, become worse off" first attested 1795 and elevated into literary use c.1800-30, where formerly worse (v.) had served.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But because underwater trees are already dead, cutting them down doesn't worsen
  the situation.
The trend is likely to worsen as water temperatures continue to rise, the
  scientists say.
Others said the solar array might worsen a water runoff problem in the area.
Unscientific comments only worsen consumer anxiety and add to news media hype.
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