汗牛充栋 Traditional 汗牛充棟 hàn niú chōng dòng 🔊 lit. enough books to make a pack-ox… + Keep this word Meanings hàn niú chōng dòng 汗牛充棟 lit. enough books to make a pack-ox sweat or to fill a house to the rafters (idiom); fig. many books Its characters 汗hànperspirationHSK 4牛niúoxHSK 3充chōngsufficient; fullHSK 7–9栋dòngclassifier for houses or buildingsHSK 6