He is so greedy that he would sell his own grandmother for money.
sell one's own grandmother
idiomTo do anything, especially unprincipled or illegal, in order to obtain what one desires.
The politician was so desperate to win the election that he would sell his own grandmother to get the necessary votes.
Driven by an insatiable hunger for power, the executive acted as though he would sell his own grandmother to secure the merger.
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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.