Synonyms of 'straighten'
neatenDictionary, arrange, tidy (up)
She looked in the mirror and straightened her hair.
Phrasal verbsstraighten something out
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If you arrange things somewhere, you place them in a particular position, usually in order to make them look attractive or tidy.
He started to arrange the books in piles.
Thesaurus for straighten from the Collins English Thesaurus
If you straighten something, you make it tidy or put it in its proper position .