a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston
an electric hand drill providing hammering in addition to rotating action
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- hammer and sickle,
- hammer and tongs,
- hammer away at,
- hammer beam,
- hammer blow,
- hammer finger,
- hammer mill,
- hammer out,
- hammer pond,
- hammer price
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012