If he saw this mess, your grandfather would turn in his grave.
turn in one's grave
idiomTo be appalled, offended or disgusted by something, despite being deceased.
Origin
first recorded 19th c. disputed originDocumented in English since 1801, perhaps from Jewish rabbinic tradition that the bones of Judah rolled about in his coffin for his shame during the Exodus.
The old musician would turn in his grave if he heard his song used in that cheap advert.
The poet, long dead but fiercely protective of his legacy in life, would surely turn in his grave to see his verses mangled for a political slogan he would have despised.
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abound in one's own sense
To follow one’s own inclinations and opinions.
- 02
ace up one's sleeve
A surprise advantage of which others are not aware.
- 03
act one's age
To behave in a manner appropriate to one's age.
- 04
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”).
- 05
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.