昏天黑地 pitch-black
Explanation
形容天色昏暗。也比喻社会黑暗混乱，或事情忙乱，令人疲惫不堪。
Describes a dark sky. It can also describe social darkness and chaos, or a situation that is busy and makes people feel exhausted.
Origin Story
传说上古时期，天地初开，混沌一片，那时没有日月星辰，人间永远笼罩在昏天黑地的黑暗之中。人们生活在恐惧和不安里，直到女娲补天，才有了光明。后来，人们用“昏天黑地”来形容天色昏暗，也比喻社会黑暗混乱，或事情忙乱得让人疲惫不堪。在一个偏僻的小山村里，住着一位老中医，他医术高明，但为人古怪。一天，一位年轻的书生不慎跌落山崖，昏迷不醒。村里人束手无策，只有老中医愿意尝试治疗。老中医将书生带回自己的小屋，小屋里堆满了各种草药，光线昏暗，空气潮湿，宛如一个昏天黑地的药房。老中医日夜守护着书生，精心调配药方，经过几天的治疗，书生终于苏醒过来。书生回忆起昏迷前的景象，只记得昏天黑地，什么也看不见，而醒来后，却看到老中医在昏暗的小屋里用尽全力救治自己，他深受感动。从此，他专心学习医术，希望将来也能像老中医一样，在昏天黑地中救死扶伤。
Legend has it that in ancient times, when heaven and earth were first created, everything was in chaos. There was no sun, moon, or stars, and the world was forever shrouded in darkness. People lived in fear and anxiety until Nuwa mended the heavens and brought light. Later, people used "dark heaven and earth" to describe the dark sky, but also to describe social darkness and chaos, or to describe a situation where people were too busy and exhausted. In a remote mountain village, there lived an old Chinese medicine doctor who was skilled in medicine but had an eccentric personality. One day, a young scholar accidentally fell off a cliff and lost consciousness. The villagers were helpless, and only the old Chinese medicine doctor was willing to try to treat him. The old Chinese medicine doctor took the scholar back to his small house, which was filled with various herbs. The light was dim, the air was humid, like a dark pharmacy. The old Chinese medicine doctor guarded the scholar day and night, carefully preparing prescriptions, and after several days of treatment, the scholar finally woke up. The scholar recalled the scene before he lost consciousness, only remembering the darkness, he could see nothing, but when he woke up, he saw the old Chinese medicine doctor doing his best to treat him in the dark house, he was deeply touched. From then on, he devoted himself to the study of medicine, hoping that in the future he could also be like the old Chinese medicine doctor, saving lives and healing the injured in the darkness.
Usage
常用来形容天色昏暗，也可以比喻社会黑暗混乱或工作繁忙、劳累不堪的状况。
Often used to describe a dark sky, it can also be used to describe social darkness and chaos or a busy and tiring situation.
Examples
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暴雨倾盆，昏天黑地，什么也看不见。
bàoyǔ qīngpén, hūntiānhēidì, shénme yě kànbujiàn
The torrential rain made it pitch-black, and nothing could be seen.
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经过几天的奋战，终于完成了这项昏天黑地的工作。
jīngguò jǐ tiān de fènzhàn, zhōngyú wánchéng le zhè xiàng hūntiānhēidì de gōngzuò
After several days of hard work, the grueling work was finally completed.