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，过份自信，自不量力”。

【例句】
The anaconda bit off more than it could chew. It just killed a big cow but couldn't swallow it.
那条蟒蛇自不量力。它杀死了一头大奶牛，却吞不了它。

By accepting two part-time jobs, he is clearly biting off more than he can chew.
通过接受两份兼职工作，他显然是承担力所不能及的事。