sledge·ham·mer
noun/ˈsledʒhæmə(r)/
/ˈsledʒhæmər/
Idioms - a large heavy tool with a long handle and a metal block at one end, used for breaking rocks, etc.
（有长柄的）大锤
Idioms
use a sledgehammer to crack a nut
- to use more force than is necessary
抡着大锤砸核桃；杀鸡用牛刀