行いを改めるを英語でなんと言うか？

clean up act と言います。1:07 and an opportunity to clean up her act. アメリカのじゃじゃ馬娘がイギリスの学校で矯正されるいい機会。

Wild Child (2008) Official Trailer #1 - Emma Roberts, Aidan Quinn Movie HD
https://www.youtube.com/watch?v=g0qn2I1eIzs  0:50 as the country prepares for landmark elections, its quasi-civilian administration and the former military rulers behind it wants show they have cleaned up their act. 年末の総選挙に余念の無いミヤンマーでは、旧軍事政権の幹部たちに操られる半文民選挙委員会が「新しく生まれ変わったミヤンマー」アピールしたい考えだ。 Myanmar grapples with jade troubles | FT Business

練習問題解答
a-2205 cleaned up their act
a-3232 cleaned up their actbr
a-3649 clean their act up
a-7053 cleaned up its act