Verb
/ˈtəfən/,

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toughening, present participle; toughened, past tense; toughens, 3rd person singular present; toughened, past participle; 
                    
                    
                        
        
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Make or become tougher
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he tried to toughen his son up by sending him to public school
                                            
 
 
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if removed from the oven too soon meringues shrink and toughen
                                            
 
 
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Make (rules or a policy) stricter and more harsh
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new congressional efforts to toughen the laws
                                            
 
 
 
                     
 
 
Web Definitions:
 
 
 
 
- make tough or tougher; "This experience will toughen her"