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English definition of “stiffen”

stiffen

verb [I] (FIRM)    /ˈstɪf.ən/
to become firm or more difficult to bend: Beat the cream until it begins to stiffen (= become firm). His body stiffened in fear.Tight and tightening
(Definition of stiffen verb (FIRM) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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