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straighten

verb [I or T] (NOT CURVING)
 
 
/ˈstreɪ.tən/ US  /-ən/

Definition

to become straight or to make something become straight: He straightened his tie. Her hair is naturally curly but she always straightens it. The road straightens out after a few miles.Making things more or less smooth or straight
(Definition of straighten verb (NOT CURVING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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