“have eyes bigger than one's stomach”的意思是“吃不了却又想吃”，即我们汉语中常说的“眼大肚子小”。

【例句】
Little children tend to have eyes bigger than their stomachs.
孩子们总是吃不了却又想吃。

Could you help me finish these chips? I have eyes bigger than my stomach.
你能帮我吃完这些薯条吗？我眼馋肚饱，吃不下了。