Definition of "Hammer" :

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

"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: a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc.

noun: the ossicle attached to the eardrum

verb: beat with or as if with a hammer

"Hammer the metal flat."

verb: create by hammering

"Hammer the silver into a bowl."