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An direct comparison between two seemingly unlike things without using like or as that is developed at great length, occurring frequently in or throughout a work...
Ex) “Hope is the thing with feathers
That perches in the soul,
And sings the tune–without the words,
And never stops at all,
“And sweetest in the gale is heard;
And sore must be the storm
That could abash the little bird
That kept so many warm.
“I’ve heard it in the chilliest land,
And on the strangest sea;
Yet, never, in extremity,
It asked a crumb of me.”
(Emily Dickinson)
What is Extended Metaphor