A sledgehammer is a large, heavy hammer with a long handle, used for breaking up rocks and concrete.
PHRASE
殺雞用牛刀
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.
英漢詞典釋義
n.
大錘
She hit the nail with a sledgehammer.她用大錘釘釘子。She killed him by a sledgehammer.她用大錘砸死了他。She picked up the sledgehammer and began banging away with enthusiasm.她拿起大錘便用力敲打起來。
殺雞用牛刀；小題大做
It was a small and peaceful demonstration so I don’t know why there was such a big police presence. It was like using a sledgehammer to crack a nut.這只是個小型的和平示威，真不明白為什么有那么多警察，簡直是小題大做。
英英詞典釋義
Noun
1. a heavy long-handled hammer used to drive stakes or wedges