To discard or eliminate faithful subordinates or useful tools once they have served their purpose; to abandon a helper once their aid is no longer needed.
他辛辛苦苦为公司开拓市场，可如今公司发展壮大了，他却被边缘化了，真是“狡兔死，良犬烹”啊！
He worked tirelessly to expand the market for the company, but now that the company has grown, he's been marginalized. It's truly a case of 'when the cunning hare is killed, the good hound is cooked!'
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