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

1150–1200; Middle English seknen, sicnen; cognate with Old Norse sjūkna. See sick1, -en1

resicken, verb
unsickened, adjective

repulse, revolt, disgust, upset. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sicken (ˈsɪkən)
vb (often foll by for)
1.  to make or become sick, nauseated, or disgusted
2.  to show symptoms (of an illness)

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

c.1200, "to become sick," originally the verb was simply sick (c.1150), from sick (adj.). Transf. sense of "to make sick" is recorded from 1694.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Private sector employers are starting to reconsider the benefits they are able
  to pay if employees sicken or die in service.
Unlike humans, who can be infected with tuberculosis for years, mongooses
  appear to sicken and die immediately.
The narrator tries to invent a new language that won't sicken people.
Feces is filthy and any unknowing pedestrian can track this stuff into their
  house and sicken everyone.
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