Definitions of hammer:

• noun:   the act of pounding (delivering repeated heavy blows)

  Example: "The sudden hammer of fists caught him off guard"

• noun:   a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking
• noun:   a power tool for drilling rocks
• noun:   a striker that is covered in felt and that causes the piano strings to vibrate
• noun:   the part of a gunlock that strikes the percussion cap when the trigger is pulled
• noun:   a heavy metal sphere attached to a flexible wire; used in the hammer throw
• noun:   an athletic competition in which a heavy metal ball that is attached to a flexible wire is hurled as far as possible
• noun:   the ossicle attached to the eardrum
• verb:   beat with or as if with a hammer

  Example: "Hammer the metal flat"

• verb:   create by hammering

  Example: "Hammer the silver into a bowl"

• name:  A surname (common: 1 in 14285 families; popularity rank in the U.S.: #1831)