Found 2 items, similar to toughen.
English → English (WordNet) Definition: toughen toughen v : make tough or tougher; “This experience will toughen her”
English → English (gcide) Definition: Toughen Toughen \Tough"en\, v. i. & t. [imp. & p. p. Toughened; p. pr. & vb. n. Toughening.] To grow or make tough, or tougher. [1913 Webster]