“打肿脸充胖子”在英语口语里能怎么说？

地道口语：bite off more than one can chew

【影视实例】
素材来源：《欢乐合唱团》
剧情简介：

Terri说自己怀孕了，拖着Will去看房，准备给未出生的宝宝一个良好的环境。然而什么都想要的Terri让Will倍感无奈，因为照他们的经济状况，压根儿就买不起这样的房子……

Will: Thank you. We can't afford this.
Terri: We already did the math, Will. All we have to do is give up Applebee's, and we won't run the AC for the first couple of summers.
Will: Well,we certainly can't afford the grand foyer, and the sun nook. I mean, if we bite off more than we can chew, we'll lose everything. You need to pick one.
Terri: Come with me. I'm going to show you something really special.

【台词翻译】
Will: 谢谢。我们买不起诶。
Terri: 我们不是早算过了么，威尔。我们只要抛售了苹果蜂股票，然后有个几年夏天不开空调就能熬过去了。
Will: 可我们还是买不起门廊和阳台啊。如果我们打肿脸充胖子的话，我们会一无所有的。你得二选一。
Terri: 跟我来。让你看一样特别的东西。

【口语讲解】bite off more than one can chew
bite off more than one can chew就是咬下的东西超出可嚼的能力，也就是贪多嚼不烂咯，比喻超出一个人的能力所及的范围，通常是过分自信的表现哦。