verb (used with object), verb (used without object)
to straighten or become straightened out from a curl or curled position.

1580–90; un-2 + curl

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
uncurl (ʌnˈkɜːl)
to move or cause to move out of a curled or rolled up position

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
In the spring, fiddleheads gracefully uncurl into ferns.
The inflorescences uncurl and elongate as flowers open successively from base to tip.
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