(idiom) pitch-dark; dim or dark so that nothing can be seen

to feel dizzy or lightheaded; to lose consciousness; to black out or faint

describes a decadent or dissolute lifestyle, such as one spent in gambling or drinking; perverted

in a state of total disorder, confusion, or social darkness; troubled times

(of an activity) to a high degree of intensity or distraction, as if losing track of time; to the point of exhaustion