推荐回答（3个）
过河拆桥、出尔反尔、背信弃义、言行不一
信口雌黄、口蜜腹剑、胡说八道、反复无常、口中雌黄、言而无信、背信弃义、
恩将仇报、翻脸无情、口是心非、信口开河
【过河拆桥的历史典故】
元朝的大臣彻里帖木耳，处理公务精明干练，善于决断。他对科举制度深恶痛绝，决心废除这种制度。后来，他升任中书平章政事，便奏告元顺帝，请求废除科举制度，得到了丞相伯颜的支持，但反对的人很多，许有壬就是其中的一个。
许有壬对伯颜说：“如果废除科举考试制度，世上有才能的人都会怨恨的。”伯颜针锋相对地说：“如果继续实行科举考试制度，世上贪赃枉法的人还要多。”许有壬反驳说：“没有实行科举考试制度的时候，贪赃枉法的人不也有很多吗？”伯颜讽刺他说：“我看中举的人中有用之才太少，只有你参政一个人可以任用！”许有壬不服气，举出许多当时中举的高官来反驳伯额。伯颜当然不会改变自己的观点，于是两人争论得非常激烈。
第二天，皇帝在祟天门下达废除科举制席的诏书，满朝文武都要去听读，许有壬被特地安排在班首听读。尽管他心里非常不愿意，但又怕得罪皇帝，只好勉强跪在班首听读诏书。听读完诏书后，百官纷纷回府，许有壬满脸不高兴地低头走路。有个名叫普化的御史特地走到他边上，凑着他的耳朵冷嘲热讽他说：“参政，你这下成为过河拆桥的人啦。”这话的意思是，你许参政是靠科举当官的，现在宣读皇上关于废除科举制度的诏书，你跪在最前面，似乎是废除科举制度的领头人，就像一个人过了桥后就把桥拆掉一样。许有壬听了又羞又恨，加快步伐离开。之后他借口有病，再也不上朝了。
反复无常 出尔反尔 翻云覆雨 口中雌黄 言而无信
背信负义 背信弃义 弃信违义 背约负盟 背义负信
离经叛道 大逆不道 离心离德 三心二意 离经背道
弃信忘义 弃义倍信 忘恩负义 恩将仇报 过河拆桥
违信背约 言而不信 自食其言 食言而肥 背槽抛粪
藏弓烹狗 鸟尽弓藏 得兔忘蹄 得鱼忘筌 卸磨杀驴
过桥抽板 过桥拆桥 获兔烹狗 济河焚舟 有进无退
鸟得弓藏 鸟尽弓藏 兔死狗烹 上树拔梯 落井下石
恩将仇报 翻脸无情
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