suffer a big loss for a little gain 因小失大

“因小失大”，汉语成语，字面意思是“lose a great deal through trying to save a little”，比喻“为了小的利益而失去大的利益，得不偿失”，可以翻译为“suffer a big loss for a little gain”或“ lose the main goal because of small gains”。

例句：

我们不能因小失大。

We can't risk big things for the sake of small ones.

不要因小失大，而要从全盘考虑问题。

You should have the overall situation in mind, refraining from seeking small gains at great cost.