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Definition of jackhammer noun from the Oxford Advanced Learner's Dictionary

jackhammer

noun
 
/ˈdʒækhæmə(r)/
 
/ˈdʒækhæmər/
(North American English)
(British English pneumatic drill)
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  1. a large powerful tool, worked by air pressure, used especially for breaking up road surfaces
See jackhammer in the Oxford Advanced American Dictionary

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buttercup
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