To acknowledge one's enemy as a patron or master; to willingly betray one's own people or principles for personal gain, serving an adversary as if they were a parent.
他为了眼前的利益，竟然认仇作父，背叛了曾经帮助过他的人。
For the sake of immediate benefits, he actually recognized his former adversary as a patron, betraying those who had once assisted him.
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