破釜沈船：はふちんせん [ha-fu-chin-sen]

生還を考えず、決死の覚悟で出陣すること。出陣に際し、炊事をするための釜をこわし、船を沈め、退路を断つこと。

Do not think of survival, go out with a prepared mortal desperation. When going out, to break down the cooker to cook, sink the ship and cut off the withdrawal.