Webster's English Dictionary

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unbend

un.bend \.*n-'bend, '*n-\ vt 1: to free from flexure : make or allow to 
   become straight {~ a  bow} 2: to cause (as the mind) to relax  3a: to 
   unfasten (as a sail) from a spar or stay  3b: to cast loose or untie (as a 
   rope)  1: to relax one's severity, stiffness, or austerity  2: to cease to 
   be bent : become straight or relaxed