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English definition of “straighten up”

straighten up

verb uk phrasal verb with straighten   /ˈstreɪ.tən/ us    /-ən/

(POSITION)

to stand straight after bending at the waistMaking things more or less smooth or straight

(BEHAVIOUR)

US to behave well after behaving badly: You'd better straighten up or else!Becoming betterMaking things betterMaking progress and advancing
(Definition of straighten up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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