To harm or betray someone who has been kind or helpful.
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To act against or hurt someone who has been supporting or helping you.
When you bite the hand that feeds you, you show ingratitude by working against the very person who has been providing for you.
It’s often used to warn against disloyalty or to describe someone who has betrayed a benefactor.
"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