Webster's English Dictionary

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unwind

un.wind \-'wi-nd\ vt 1a: to cause to uncoil : wind off : UNROLL  1b: to 
   free from or as if from a binding or wrapping  1c: to release from tension 
   : RELAX  archaic  2: RETRACE  1: to become uncoiled or disentangled  2: to 
   become released from tension