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The Adobe Flash Player is required in order to view this content. You can get it here: toughenOne entry found. Main Entry: tough·en Pronunciation: \ˈtə-fən\ Function: verb Inflected Form(s): tough·ened; tough·en·ing \ˈtə-fə-niŋ, ˈtəf-niŋ\ Date: 1582 transitive verb : to make toughintransitive verb : to become tough 
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