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"When you portray a person, place, thing, or an action as being something else, even though it is not actually that “something else,” you are speaking metaphorically. “He is the black sheep of the family” is a metaphor because he is not a sheep and is not even black. However, we can use this comparison to describe an association of a black sheep with that person. A black sheep is an unusual animal and typically stays away from the herd, and the person you are describing shares similar characteristics."
What is Metaphor