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hammer drill

British  

noun

  1. a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston

  2. an electric hand drill providing hammering in addition to rotating action

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.