Gloom \Gloom\, v. i. [imp. & p. p. {Gloomed}; p. pr. & vb. n. {Glooming}.] 1. To shine or appear obscurely or imperfectly; to glimmer. 2. To become dark or dim; to be or appear dismal, gloomy, or sad; to come to the evening twilight. The black gibbet glooms beside the way. --Goldsmith. [This weary day] . . . at last I see it gloom. --Spenser.