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English definition of “toughen”

toughen

verb [I] (GET DIFFICULT)    /ˈtʌf.ən/
to become difficult to deal with: Amid toughening competition in the market , many firms are going out of business .Complicated and difficult to doDifficult to understand
(Definition of toughen verb (GET DIFFICULT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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