搭配 “keep an eye out for something” 的意思是 “睁大眼睛看，特别留意某人或某事，以免错过”。另一个类似的短语是 “keep your eye open for something”，意思基本相同。

例句
Keep your eye out for the postie – I’m expecting a parcel.
留意一下有没有邮递员来，我在等包裹。

She always keeps an eye out for the special offers at the supermarket.
她一直都留意看超市有没有特价商品。

Keep an eye out for my house keys – I seem to have lost them!
帮我留心一下我的房门钥匙，我好像弄丢了！