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toughen

[tuhf-uh n] /ˈtʌf ən/
verb (used with object), verb (used without object)
1.
to make or become tough or tougher.
Origin of toughen
1575-1585
1575-85; tough + -en1
Related forms
toughener, noun
Synonyms
harden, firm, strengthen, stiffen.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for toughen

toughen

/ˈtʌfən/
verb
1.
to make or become tough or tougher
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
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Word Origin and History for toughen
v.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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