Which term refers to an expression that has become monotonous through overuse?

The term that refers to an expression that has become monotonous through overuse is "cliché." Clichés are phrases or opinions that have lost their original meaning or effectiveness due to excessive repetition. They are often seen in language and literature as tired or stale, lacking originality. In effective business communication, avoiding clichés is essential to maintain clarity and engagement with the audience, as overused expressions can reduce the impact of the message.

Other terms provided in the options, such as "dangling expression," relate to grammatical errors where the subject of a sentence is unclear or misplaced. "Expletive" typically refers to an addition to the sentence structure that does not add meaning but may serve to emphasize a point or fill a pause. "Active voice" refers to a grammatical structure where the subject performs the action, making communication more direct and vigorous. None of these terms match the definition of a monotonous expression through overuse as well as "cliché."