throw someone under the bus

US /θroʊ ˈsʌm.wʌn ˈʌn.dər ðə bʌs/
UK /θroʊ ˈsʌm.wʌn ˈʌn.dər ðə bʌs/
"throw someone under the bus" picture
1.

to betray or sacrifice someone, especially to save oneself from blame or difficulty

:
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He decided to throw his colleague under the bus to avoid getting fired.
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I can't believe she would throw me under the bus like that.
:
throw someone a curveballthrow yourself at someoneunder someone's thumbthrowthrow-inthrow onthrow in