straighten up
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verb (adverb)
to become or cause to become erect
mainly US to reform or become reformed
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Which of the following nouns has an irregular plural form?
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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How to use straighten up in a sentence
Other Idioms and Phrases with straighten up
straighten up
Make tidy, as in Let's get this room straightened up. [Second half of 1800s]
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.