to do sb a disservice做伤害某人的事
I feel you have done your readers a great disservice in publishing such an uninformed piece.我觉得你发表这样一部内容空洞的作品会让读者大受其害。
You could do yourself a grave disservice by revealing all to a potential rival.把一切都暴露给潜在的对手, 这可能会对你大为不利。