noun
drop hammer
A mechanical hammer that is raised and then dropped to deliver a blow, used in forging, pile driving, or similar heavy work.
鍛冶屋はドロップハンマーで熱した鉄を叩いた。
The blacksmith struck the heated iron with a drop hammer.
Variant with interpunct; less common but still seen.
Loanword from English 'drop hammer'.