1N-COUNT (用于击碎岩石和混凝土的)大锤 A sledgehammer is a large, heavy hammer with a long handle, used for breaking up rocks and concrete. (用于击碎岩石和混凝土的)大锤
2PHRASE [Ns inflect]杀鸡用牛刀 If you say that someone is using a sledgehammer to crack a nut, you mean that they are using stronger measures than are really necessary to solve a problem. 杀鸡用牛刀