How is "cliché" best defined?

The term "cliché" refers to an expression, idea, or element that has been overused to the point that it has lost its original significance or effectiveness. Thus, defining it as "an overused expression lacking original thought" accurately captures its essence. In language and communication, a cliché often fails to inspire or convey meaning because it has become too familiar and predictable, making it less impactful or engaging.

The other descriptions do not align with the meaning of "cliché." For example, a fresh and innovative idea would be the opposite of a cliché, representing originality rather than repetitiveness. Similarly, a rare and highly valued expression suggests uniqueness and scarcity, which contradicts the concept of something being overused. Lastly, calling it a complex and original metaphor also misrepresents the term, as clichés are typically simplistic and often lack depth. Thus, identifying a cliché in the context of language relates specifically to its overuse and the resulting lack of originality.