He needs to clean up his act and stop being late.
clean up one's act
idiomTo reform; to improve one's habits.
After getting a warning at work, she decided to clean up her act and arrive on time.
The once-notorious musician, now a father of two, finally cleaned up his act, trading late nights and chaos for early mornings and stability.
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abound in one's own sense
To follow one’s own inclinations and opinions.
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ace up one's sleeve
A surprise advantage of which others are not aware.
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act of Congress
An authorization that is extremely difficult to obtain, especially in a timely fashion.
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act one's age
To behave in a manner appropriate to one's age.
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act one's age, not one's shoe size
Synonym of act one's age (“to behave in a mature manner; to avoid being childish”).
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act out
To perform something specific.
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act the hypocrite
To behave deceitfully or hypocritically; to dissemble.
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act up
To misbehave; to cause trouble.