窟窿 Save Sign in to save words On the HSK 7-9 vocabulary list, at CEFR level C2. kūlong ㄎㄨ ˙ㄌㄨㄥ hole pocket cavity loophole debt Character by character 窟(kū)cave 窿(long)cavity A Chinese word or character, or English Search 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