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 ).

1535–45; straight + -en1

straightener, noun
overstraighten, verb
prestraighten, verb (used with object)
restraighten, verb
unstraightened, adjective
well-straightened, adjective Unabridged
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

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
The copper tubing is straightened, put through the length of the pipe, with the
  end bent down near the bottom of the bucket.
However, he straightened his legs in such fashion that it came to the ground
  without a jar.
Joseph straightened his shoulders, but as they approached the cliff, he felt
  his stomach kink.
He curled his hands around the bar and then uncurled them and straightened up.
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