To bite off more than you can chew 自不量力
成語 bite off more than you can chew 的意思是你不能正確估量自己的能力，對自己估計太高或承擔超過自己所能勝任的事情。
I have bitten off more than I can chew by taking on this extra work – I don't think I'll get it finished on time.
David and Sarah planned to completely renovate their house by themselves. In the end, they bit off more than they could chew and had to pay builders to finish it.
Thanks for offering to babysit AND cook dinner for us, but don't bite off more than you can chew.
英語中的另一個同鱷魚相關的短語是 crocodile tears 相當於漢語中的鱷魚眼淚，惡人假慈悲。
Louise is crying in the corner because she says the boss upset her – don't pay any attention to her, though – they're just crocodile tears.