Bite off more than one can chew
承擔超出自己能力范圍的任務，導致難以完成或陷入困境。
用于提醒或批評某人過于自負或貪多。
英文釋義
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.
典故來源
源自19世紀美國，原指咬下太大塊食物無法咀嚼，后比喻承擔過多責任。