He is so punctual that you can set your watch by him.
set one's watch by someone
idiomTo know the current time by observing a very punctual and reliable person going about their regular routine.
My neighbor leaves for work at exactly eight, so I set my watch by him every morning.
The old station master was a man of such rigid habit that the villagers would often set their watch by his daily arrival on the platform.
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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 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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afraid of one's own shadow
Exceptionally timid.
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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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albatross around one's neck
A characteristic, possession, associate, or previous deed that hinders one's ability to succeed.