bite off more than one can chew的字面意义，如果贪多贪快，一下咬下一大口，那就会产生贪我嚼不烂的现象，吃不下去，即使吃下去了，也消化不了。比喻一个人好高骛远，过高地估计自己的能力

【例句】
He bit off more than he could chew when he undertook to do all the organizing by himself.
他独自承担全部组织工作，他对自己的能力估计过高了。

You want to learn English, French, and German all at once? Young man, you will bite off more than you can chew.
你想同时学英、法、德三种语言？年轻人，你那样做可是太好高骛远了。