TOFEL 成語：Eat one's own words

[bryanchang]

1. 競爭對手發表 iPod shuffle.

2. 在媒體上痛批對手產品：

"Actually, to me it's a big let-down: we're expecting a good fight but they're coming out with something that's five generations older," Wong Hoo said. "It's our first generation MuVo One product feature, without display, just have a (shuffle feature). We had that--that's a four-year-old product."

"So I think the whole industry will just laugh at it, because the flash people--it's worse than the cheapest Chinese player," he added. "Even the cheap, cheap Chinese brand today has display and has FM. They don't have this kind of thing, and they expect to come out with a fight; I think it's a non-starter to begin with."

3. 對手的爛產品大賣

4. 看看附近沒人注意，趕快也推出同樣類型的產品

[悲]

教育部成語典如是解：

據《左傳．哀公二十五年》載，春秋魯哀公二十五年六月，魯哀公從越國回來，與前來五梧迎接他的大夫季康子、孟武伯會合，並且設宴飲酒，由孟武伯代表向哀公敬酒祝壽。孟武伯十分厭惡為哀公御車的寵臣郭重，在宴席上就問他：「你為什麼這麼肥胖？」當下季康子認為孟武伯說話失當，要罰他飲酒。而哀公則是因為季康子和孟武伯時常失信於他，於是指桑罵槐地說：「是食言多矣，能無肥乎？」意思是，他把太多說出來的話又吃下去，怎麼能不肥呢？「食言而肥」這句成語就從這裡演變而出，用來比喻說話不守信用。

[bryanchang]

看來我的國文已經快還回去了...

這個應該是 Eat one's words 的範例

[ulysses]

他們也沒有食言啊，之前的發言也沒說他們絕對不會出類似產品這種話。
真要用合適的詞來形容大概就是

打腫臉充胖子
言行不一
牆頭草
假仙
賤

[悲]

或說「時務者為俊杰」、「知錯能改，善莫大焉」