hammer

A tool with a heavy head and a handle used for pounding.

"Bobby used a hammer and nails to fix the two planks together"

The act of using a hammer to hit something}}

"The nail is too loose - give it a hammer."

A moving part of a firearm that strikes the firing pin to discharge a gun.

To strike repeatedly with a hammer, some other implement, the fist, etc.

"Tony hammered on the door to try to get him to open."

To form or forge with a hammer; to shape by beating.

To emphasize a point repeatedly.