1. a tool with a heavy metal head and a handle, used for hitting nails or breaking things
2. a part of a gun that strikes the firing pin

1. to hit something with a hammer or similar tool
2. to hit something repeatedly and forcefully
3. to criticize someone or something severely
Usage: informal

Examples

• He used a hammer to drive the nail into the wall.
• The carpenter’s hammer had a wooden handle.
• She hammered the metal into shape.
• Rain hammered against the windows all night.
• The critics hammered the new movie.
• He hammered on the door until someone answered.
• The blacksmith hammered the hot iron on the anvil.