jackhammer

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jackhammer /ˈʤækˌhæmɚ/ noun
plural jackhammers
jackhammer
/ˈʤækˌhæmɚ/
noun
plural jackhammers
Learner's definition of JACKHAMMER
[count] chiefly US
: a heavy tool used to break hard substances (such as concrete) into pieces by a repeated pounding action
called also pneumatic drill
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