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verb (used with object), verb (used without object)
to make or become thick or thicker.
to make or grow more intense, profound, intricate, or complex: The plot thickens.

1375–1425; late Middle English thiknen < Old Norse thykkna. See thick, -en1

rethicken, verb
unthicken, verb (used with object)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thicken (ˈθɪkən)
1.  to make or become thick or thicker: thicken the soup by adding flour
2.  (intr) to become more involved: the plot thickened

thickening (ˈθɪkənɪŋ)
1.  something added to a liquid to thicken it
2.  a thickened part or piece

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

"substance used to thicken something," 1839, from thicken (see thick).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The same thickening is found in all fossil and modern cetaceans but not in
  other mammals, the group notes.
The data fog is thickening at a time when companies are trying to squeeze ever
  more out of their workers.
The thickening of the mantle layer gradually extends in a dorsal direction, and
  forms the posterior column of gray substance.
Thirdly, the employment of the fulling mill for thickening the cloth, instead
  of treading it in water.
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