• 1. a hand tool consisting of a heavy usually steel head held transversely on the end of a handle, used for driving in nails, beating metal, etc
• 2. any tool or device with a similar function, such as the moving part of a door knocker, the striking head on a bell, etc
• 3. a power-driven striking tool, esp one used in forging. A pneumatic hammer delivers a repeated blow from a pneumatic ram, a drop hammer uses the energy of a falling weight
• 4. a part of a gunlock that rotates about a fulcrum to...

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