How does an oxymoron combine contradictory words?

An oxymoron is a rhetorical device that functions by deliberately juxtaposing words that appear to be contradictory or mutually exclusive. By pairing these opposing terms—such as "heavy lightness" or "cold fire"—the speaker or writer creates a condensed, meaningful paradox that highlights the complexity of an idea or emotion.12

This combination can occur in two primary ways:

• Two-word phrases: The most common form, where two distinct words with conflicting meanings are placed together to create a new, often poetic, sense of meaning (e.g., "sweet sorrow").12
• Single words: Occasionally, a single word may contain two internal, conflicting ideas, such as "bittersweet," where the root components themselves suggest opposing qualities.12

While these phrases may seem illogical at first glance, they are used to capture nuances that standard language might fail to express, effectively "painting a picture" through the tension between the chosen words.13