bite off more than one can chew 字面意思“贪多嚼不烂”，可以意为“承担力所不能及的事，自不量力，心有余而力不足”。

【例句】
Yeah. But he found that he had bitten off more than he could chew.
是啊。可能发现自己的摊子铺得太大，心有余而力不足。

It feels like I bit off more than I could chew when I promised to complete this worksheet in one day.
当答应在一天内完成这张工作表时，我觉得自己自不量力。