To illuminate means to:

To illuminate means to make something lighter or brighter, often by providing light in a physical sense or enhancing understanding in a figurative sense. When you illuminate a room, you are adding light to it, making it easier to see and perceive details. This concept can also extend beyond physical light; for example, when you illuminate a topic, you make it clearer and easier to understand, shedding light on complex ideas. The other choices present meanings that are contrary to illumination. For instance, making darker and harder to see or diminishing light intensity directly opposes the idea of lighting up or clarifying something.