A metaphor is best defined as?

A metaphor is indeed best defined as a direct comparison between two unrelated things. Unlike similes, which explicitly use "like" or "as" to draw a comparison, metaphors assert that one thing is another, conveying deeper meaning or illustrating a concept by linking two distinct ideas. This figurative language enriches writing by allowing readers to make associations and understand complex ideas through familiar imagery.

For instance, when someone says “Time is a thief,” they don’t mean that time literally steals; instead, this metaphor conveys the idea that time can take away life experiences, moments, or opportunities in an impactful way. Such comparisons can help create vivid imagery and engage the reader's imagination. This aspect of metaphor is what distinguishes it from the other types of figurative language mentioned in the choices.