Worn-out topic is a writing, research, or communication concept related to a paper that is dull or unoriginal because the topic has been overworked. Abortion, Legalizing Marijuana, Global Warming, and Lowering the Drinking Age are all examples of worn-out topics.
In professional and technical communication, worn-out topic helps writers plan, draft, revise, review, or present information in a way that fits the audience and purpose.