Definition of clean up one's act in English:

clean up one's act

phrase

informal
  • Begin to behave in a better way, especially by giving up alcohol, drugs, or illegal activities.

    ‘he planned to clean up his act, but in a last celebration bought some coke and heroin’
    • ‘Now is the time to sift through those cluttered cupboards and clean up your act.’
    • ‘Now comes the time to get real and clean up my act.’