To betray or sacrifice someone for personal gain or protection.
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To blame or betray someone else, often unfairly, to protect yourself.
When you throw someone under the bus, you let their name take the damage so you don't have to.
It's common at work and in politics.
"Stab Someone in the Back"
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Betray someone secretly, especially someone who trusted you
"Sell Someone Out"
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Betray someone for personal gain or money
"Throw Someone Under the Bus"
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Sacrifice someone else to protect or benefit yourself