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English definition of “toughen”

toughen

verb [T] (MAKE STRONG)    /ˈtʌf.ən/
to make something or someone tough, strong, or stronger: The UN announced its intentions to toughen sanctions still further. The government wants to toughen (up) the existing drug laws/controls. His time in the army certainly toughened him up. Car windows are usually made from toughened glass.Becoming and making stronger
(Definition of toughen verb (MAKE STRONG) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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