What does "euphemism" mean?

A euphemism is defined as a mild or indirect word or expression that is used in place of one that may be considered harsh, blunt, or unpleasant. This linguistic device serves to soften the impact of what is being communicated, making it more palatable for the audience. For instance, saying "passed away" instead of "died" is a common euphemism that illustrates how language can be modified to convey sensitivity.

In this context, the other options do not align with the definition of euphemism. Exaggerated statements (such as hyperbole) emphasize something beyond reality, while direct remarks lack any mildness and may be more abrasive. Comparisons between unrelated things would refer to metaphors or similes, which focus on illustration rather than the softened language that euphemisms provide. Thus, the choice that describes a mild expression replacing a harsher one accurately captures the essence of what a euphemism is.