Definitions

1. noun

A portable, usually gasoline-powered tool with a heavy steel head that is driven up and down by a piston, used for breaking up rock or concrete, or for driving stakes or pipes into the ground.

“The construction workers used a jackhammer to break through the concrete floor.”

2. verb

To hit or pound something repeatedly with a jackhammer, especially in a loud and violent manner.

“The protesters began to jackhammer on the pavement to make their voices heard.”