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English definition of “straighten up”

straighten up

(BEHAVIOUR) US phrasal verb with straighten     /ˈstreɪ.tən/ US  /-ən/ verb
to behave well after behaving badly: You'd better straighten up or else!Becoming betterMaking things betterMaking progress and advancing
(Definition of straighten up (BEHAVIOUR) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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