QUESTION: What do you mean by Metonymy?
ANSWER: Metonymy is derived from a Greek word. Its meaning is 'a change of name'. In this figure of speech the name of some object or idea is substituted for another to which it has some relation.
For example:  He succeeded to the crown - The monarchy.
 From the cradle to the grave - From childhood to death.
 I never read Homer - The works of Homer.