To abandon righteousness and betray faith; to act without integrity or loyalty; to break one's word and principles.
他曾发誓要维护团队的利益，但最终却弃义倍信，为了私利而出卖了重要的商业秘密。
He once swore to uphold the team's interests, but in the end, he abandoned righteousness and betrayed trust, selling off important business secrets for personal gain.
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