straighten

[streyt-n]
verb (used with object), verb (used without object)
to make or become straight in direction, form, position, character, conduct, condition, etc. (often followed by up or out ).

Origin:
1535–45; straight + -en1

straightener, noun
overstraighten, verb
prestraighten, verb (used with object)
restraighten, verb
unstraightened, adjective
well-straightened, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
straighten (ˈstreɪtən)
 
vb (sometimes foll by up or out)
1.  to make or become straight
2.  (tr) to make neat or tidy: straighten your desk
 
'straightener
 
n

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
There was enough to do besides, to straighten up things.
The strands straighten out when pulled, but they relax back to their tangled
  shape when the tension is released.
They thought that a low hum might straighten out those bent cochlear hairs.
The next step could be to remove road crossings and straighten some of the
  track.
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