To be unconscious or in a coma; to lose awareness of one's surroundings.
省知觉。指昏迷过去，失去知觉。也指不懂人情世故。
宋·汪应辰《与朱元晦》问其无所苦否，则曰‘无事，无事’。寻即不省人事。”
After the accident, he lay on the ground, completely oblivious to the world.
Learn the next connected idiom: 不省人事 (bù xǐng rén shì) → 事半功倍 (shì bàn gōng bèi)
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