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

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)
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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Word Origin & History

"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
It's a huge topic in this arid country of mostly desert land, dying river
  systems, and frequent and worsening droughts.
But it's clear that authorities are being disingenuous when they claim that
  casualty data are worsening.
In other words, destroying nuclear facilities would address the symptoms while
  worsening the underlying disease.
The area's worsening demographics have made it less interesting to investors
  and even the national government.
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