If you ignore the safety rules, you will have his blood on your head.
have someone's blood on one's head
idiomTo be responsible for someone's death, pain, or misfortune.
The captain knew the ship was unsafe, but he sailed anyway and now has the crew's blood on his head.
By recklessly disregarding the warnings of his advisors, the king ultimately had the blood of thousands on his head.
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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.