jackhammer

Từ điển Oxford Advanced Learner 8th

jack·ham·mer [jackhammer jackhammers] BrE [ˈdʒækhæmə(r)] NAmE [ˈdʒækhæmər] (NAmE) (BrE pneuˌmatic ˈdrill) noun
a large powerful tool, worked by air pressure, used especially for breaking up road surfaces
See also: ↑pneumatic drill

• Từ đồng nghĩa / Synonyms:
  air hammer, pneumatic hammer