What is the term for a verbal expression that is not meant to be taken literally?

The term for a verbal expression that is not meant to be taken literally is a figure of speech. This concept encompasses a wide range of rhetorical devices and expressions that convey meanings in a more imaginative or non-literal way. Figures of speech include metaphors, similes, idioms, and hyperbole, among others.

While idioms and metaphors are specific types of figures of speech, the term "figure of speech" serves as an umbrella category that covers all such expressions. This is why it is the most accurate choice in this context. The capability of figures of speech to evoke imagery or convey emotions without adhering to literal interpretation is fundamental to effective communication and creativity in language use.