Bite off more than one can chew
承担超出自己能力范围的任务，导致难以完成或陷入困境。
用于提醒或批评某人过于自负或贪多。
英文释义
To take on more responsibility than one can manage.
例句
He bit off more than he could chew by taking on three projects at once.
典故来源
源自19世纪美国，原指咬下太大块食物无法咀嚼，后比喻承担过多责任。