To harm or betray someone who has been kind or helpful.
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To act against someone who has been supporting or helping you.
When you bite the hand that feeds you, you turn on the very person who provides for you.
It's often used to warn against disloyalty.
"Throw Someone Under the Bus"
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Sacrifice someone to avoid blame or protect yourself
"Stab Someone in the Back"
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Betray someone secretly, especially a person who trusted you
"Bite the Hand that Feeds You"
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Betray or act against someone who has been supporting you