What does toughened mean?we found 1 entry for the meaning of toughened
 

Toughen \Tough"en\, v. i. & t. [imp. & p. p. Toughened; p. pr. & vb. n. Toughening.]

To grow or make tough, or tougher.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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