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) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To thicken
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

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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Example sentences
Whether particulates in a mix are hydrophobic or hydrophilic, adding water can
  thicken the mix.
The mixture will thicken up a bit so that it almost coats the back of a spoon.
Slightly thicken the stock and add sour cream and, if desired, salt and pepper
  to taste.
Heat over medium heat, stirring constantly until mixture starts to thicken and
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