Antonyms for the phrase "make bright" imply dimming, darkening or dulling. These include terms such as "dim," "darken," "bleak," "dreary," and "gloomy." Contrarily, words such as "shadows," "dusky" and "surly" tends to reinforce the idea of something that is dreary. Likewise, terms such as "subdue," "submerge," and "conceal" suggest a kind of suppression of light or vibrancy, dulling it out of view. Thus, the antonyms for "make bright" carry with them such nuanced meanings that can add emphasis to their opposites, and evoke the image of a lifeless, gloomy, and dull space.