Metaphor

1.Definition of metaphor

Is a figure of speech which make animplicit, implied or hidden cimparison between two things that are unrelated but share some common characteristics.

2. The Extended Metaphor

Kind to the metaphor is the extended metaphor, which is pretty much exactly what it sounds like:  a metaphor written large and lengthy to make an even deeper, more involved comparison between the subject and the thing it's being compared with.
Extended metaphor often pop up in poetry and fiction, as in this passage from poet emily dickinson, who was a great lover of extended metaphor:

* my life had stood-a loaded gun-in corners-till a day

* The owner passed-identified-and carrier me away