fight tooth and nail (for something)/fight something tooth and nailto try very hard to do or achieve something, or to prevent something 全力以赴（争取某事物） He’s rich now, but he had to fight tooth and nail for it. 他现在有钱了，但那是他奋斗出来的。
→ fight tooth and nail (for something)/fight something tooth and nail at fight1(4)