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thicken

[thik-uh n]
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verb (used with or without object)
  1. to make or become thick or thicker.
  2. to make or grow more intense, profound, intricate, or complex: The plot thickens.

Origin of thicken

1375–1425; late Middle English thiknen < Old Norse thykkna. See thick, -en1
Related formsre·thick·en, verbun·thick·en, verb (used with object)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for thicken

thicken

verb
  1. to make or become thick or thickerthicken the soup by adding flour
  2. (intr) to become more involvedthe plot thickened
Derived Formsthickener, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for thicken

v.

early 15c. (transitive), 1590s (intransitive), from thick + -en (1). Related: Thickened; thickening. An earlier verb was Old English þiccian.

Online Etymology Dictionary, © 2010 Douglas Harper