To discard or eliminate loyal subordinates once they have served their purpose and are no longer needed; to kick someone to the curb after their usefulness has expired.
他为这个项目付出了全部心血，然而项目一成功，他就被边缘化了，真是兔尽狗烹啊。
He poured all his efforts into this project, but as soon as the project succeeded, he was marginalized. It's truly a case of 'discarding the hounds after the hares are caught'.
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