un·curl /ˌʌnˈkɚ/
  (v.)弄直卷著東西;使變直
  Un·curl v. t.  To loose from curls, or ringlets; to straighten out, as anything curled or curly.
     He sheaths his paw, uncurls his angry mane.   --Dryden.
  Un·curl, v. i. To become uncurled, or straight.
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  uncurl
       v : move out of a curled position; "He uncurled himself"