A powerful tool that uses compressed air or electricity to pound a heavy metal bit up and down, breaking concrete, rock, or pavement. It is often used in construction and road work.
A compound of “jack” and “hammer.” “Jack” has long been used in English for mechanical tools or devices that do heavy work, like “car jack” or “jackknife.” Put together, “jackhammer” literally means a hammer that works like a mechanical helper.
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