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smarten up (one's) act

Translations

взяться за ум, улучшить поведение

He needs to smarten up his act if he wants to keep his job.

Ему нужно взяться за ум, если он хочет сохранить свою работу.

Definitions

To improve one's behavior, performance, or attitude, often in response to criticism or as a way to meet expectations or standards.