Jackhammer
[jak-ham-er] /ˈdʒækˌhæm ər/
noun
1.
a portable drill operated by compressed air and used to drill rock, break up pavement, etc.
/ˈdʒækˌhæmə/
noun
1.
a hand-held hammer drill, driven by compressed air, for drilling rocks, etc
n.
also jack hammer, 1903, from jack (n.) + hammer (n.). As a verb by 1965.
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