make tough or tougher
Accustom, anneal, Bake, be good for, benefit, brutalize, calcify, coagulate, concrete, crystallize, desensitize, discipline, fortify, fossilize, habituate, indurate, inure, Numb, ossify, Season, Set, solidify, stiffen, strengthen, Temper, toughen, brutalise, desensitise
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