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 for worsens
As the ability to change focus worsens, the prescription needs to be changed accordingly.
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