Toughening

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Toughen \Tough"en\, v. i. & t. [imp. & p. p. {Toughened}; p. pr.
     & vb. n. {Toughening}.]
     To grow or make tough, or tougher.
     [1913 Webster]