To abandon one's helpers or benefactors once their assistance is no longer needed; to kick away the ladder after climbing up; to be ungrateful and discard people after achieving one's goal.
他成功后，就对曾经帮助过他的同事过桥拆桥，让人十分寒心
After his success, he abandoned the colleagues who had helped him, which was truly disheartening.
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