: a heavy tool used to break hard substances (such as concrete) into pieces by a repeated pounding action
What made you want to look up jackhammer? Please tell us where you read or heard it (including the quote, if possible).
Take Our 10-Question Quiz
The commonly misspelled words quiz
How strong is your vocabulary?
The Vocab Quiz Game for iPhone & iPad
"Incredibly fun and addictive. And informative!" User Review, iTunes