A cliché is an overused expression or idea that has lost its originality and impact due to frequent repetition. Common examples include phrases like "time heals all wounds" or "think outside the box." Clichés can be found in everyday language, literature, and media, often serving as shorthand for complex thoughts. While clichés can make communication easier by conveying familiar concepts, they can also weaken writing and speech. Relying too heavily on clichés may lead to a lack of creativity and depth, making it important for writers and speakers to seek fresh expressions to convey their ideas effectively.