A metaphor is a figure of speech in which two dissimilar things
are used to make a comparison, but an extended metaphor is a
comparison that is continuously being made throughout a written
work (more commonly in poetry).
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A very involved metaphor is often called an extended metaphor. This type of metaphor continues throughout a paragraph, stanza, or even an entire work, drawing out the comparison and exploring it in detail.
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When a metaphor is continued throughout several lines of poetry, it is called an extended metaphor. It deepens the meaning and creates a more vivid image or comparison for the reader.
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She uses extended metaphor to give more idea of the text