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
People who are ill or have conditions that could be worsened by fasting are
  specifically exempted from taking part.
The whole department pointed invisible daggers at me, and the situation
And as devices have gotten smaller in size but richer in features, things have
  only worsened.
Their performance progressively worsened throughout the day.
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