war to the knife
 你死我活的搏鬥
 Knife n.; pl. Knives
 1. An instrument consisting of a thin blade, usually of steel and having a sharp edge for cutting, fastened to a handle, but of many different forms and names for different uses; as, table knife, drawing knife, putty knife, pallet knife, pocketknife, penknife, chopping knife, etc..
 2. A sword or dagger.
    The coward conquest of a wretch's knife.   --Shak.
 Knife grass Bot. a tropical American sedge (Scleria latifolia), having leaves with a very sharp and hard edge, like a knife.
 War to the knife, mortal combat; a conflict carried to the last extremity.