Metaphor is describing a trait to compare a physical attribute. "Pale as a ghost" describes a person with a white sickly appearance. descriptive way to describe a condition to make the listener "visualize" the meaning.
Metaphor is a figure of speech that, for rhetorical effect, directly refers to one thing by mentioning another. It may provide clarity or identify hidden similarities between two ideas. Metaphors are often compared to other types of figurative language, such as antithesis, hyperbole, metonymy and simile.
