hammer
Definitions
A hand tool with a heavy metal head used for breaking objects or driving nails.
A part of a mechanism that strikes another part, such as the firing pin of a gun or the string of a piano.
To strike or beat repeatedly with or as if with a hammer.
Examples
He used a heavy hammer to drive the nail into the wooden board.
The blacksmith began to hammer the glowing iron into the shape of a horseshoe.
You should hammer out the details of the contract before signing it.