肝 On the HSK 6 vocabulary list, at CEFR level C2. gān ㄍㄢ liver (CL:葉|叶[ye4]) to put in long hours, typically late into the night, playing (a video game) slang involving a lot of repetition in order to progress grindy of a video game Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT