intransitive verb
Definition: To hit something repeatedly or to work hard on a task without stopping.
Example: She hammered away at her homework until it was finished.
noun
Definition: A tool with a heavy head and a long handle, used for hitting things, especially nails.
Example: He used a hammer to drive the nails into the wood.
transitive verb
Definition: To hit something repeatedly with a heavy tool, usually to shape it or to fasten it together.
Example: He hammered the nail into the wall to hang the picture.