General Definition: 1. Something you hold in your hand to hit other things with, especially a tool designed for this purpose, or any thing or any action that can be associated with this in context. As a Noun: 1. A tool that you use for hitting things, especially nails. It consists of a heavy piece of metal at the end of a handle. English = hammer. As a Verb or Adjective: 1. To hit something, especially a nail, with a hammer. English = hammer.