Answer:

uncurls

Answer	Crossword Clue
UNCURLS	Straightens, as hair
UNCURLS	Straightens out
UNCURLS	Straightens, as locks

UNCURLS	Straightens, in a way
UNCURLS	Fixes locks, in a way

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.