汗牛充栋

hàn niú chōng dònghanniuchongdong

lit. enough books to make a pack-ox sweat or to fill a house to the rafters (idiom); fig. many books

Characters in this word

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences