Hypertext Webster Gateway: "toughen"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Toughen \Tough"en\, v. i. & t. [imp. & p. p. {Toughened}; p. pr.
& vb. n. {Toughening}.]
To grow or make tough, or tougher.
From WordNet (r) 1.7 (wn)
toughen
v : make tough or tougher; "This experience will toughen her"
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