Go back on one’s word：it means to break a promise or fail to keep a commitment that one has previously made. （食言，违背诺言或未能履行先前所作的承诺）
以下是高频短语“Go back on one’s word”在美剧语料库中的相关例句：
E.G.1：I already said yes. I can’t go back on my word. （Suits S03E02 41:11）
参考翻译：我已经答应了，我不能食言。E.G.2：I stake my reputation on it. Two minutes later, you hire a fifth-year. You went back on your word, and you made me look like a fool. （Suits S02E12 04:03）
参考翻译：我以我的声誉担保。两分钟后，你雇了一位五年级的律师。你食言了，让我看起来像个傻瓜。E.G.3：You just agreed to those terms. Those were bullshit terms. So you’re going back on your word? （Suits S04E06 22:49）
参考翻译：你刚刚同意了那些条件。那些都是胡扯的条件。所以你要食言吗？E.G.4：Donna, I would never go back on my word. — That’s not true and you know it. You make impulsive decisions and you go back on them all the time. （Suits S06E10 25:53）
参考翻译：唐娜，我绝不会食言。–那不是真的，你知道的。你做出冲动的决定，然后总是食言。
