奋不顾身
Neck or nothing.
At all hazards.
To go all lengths.
Take one's life in one's hands.
Move heaven and earth.

eg：Neck or nothing, the fireman goes into the house to save the girl.

中英俚语俗语来源：司马迁·报任少卿书：“常思奋不顾身，以殉国家之急。”

同义词：舍得一身刷 To tempt providence.
反义词：畏缩不前 Back out of.