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toughen

[tuhf-uh n]
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verb (used with or without object)
  1. to make or become tough or tougher.
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Origin of toughen

First recorded in 1575–85; tough + -en1
Related formstough·en·er, noun

Synonyms

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harden, firm, strengthen, stiffen.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for toughen

toughen

verb
  1. to make or become tough or tougher
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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 toughen

v.

1580s, from tough (adj.) + -en (1). Related: Toughened; toughening.

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Online Etymology Dictionary, © 2010 Douglas Harper