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English definition of “straighten up”

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straighten up

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

(POSITION)

to stand straight after bending at the waist

(BEHAVIOUR)

US to behave well after behaving badly: You'd better straighten up or else!
Translations of “straighten up”
in Chinese (Traditional) 姿勢, 挺直身體,直起身…
in Russian выпрямляться…
in Turkish doğrulmak, ayağa kalmak, düz durmak…
in Chinese (Simplified) 姿势, 挺直身体,直起身…
in Polish wyprostować się…
(Definition of straighten up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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