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straighten up

(POSITION) phrasal verb with straighten
 
/ˈstreɪ.tən/
 
US  /-ən/ verb

Definition

to stand straight after bending at the waistMaking things more or less smooth or straight
(Definition of straighten up (POSITION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of straighten up