hàn​niú​chōng​dòng

immense collection of books

Senses

汗牛充栋/ 汗牛充棟 hàn​niú​chōng​dòng immense collection of books

Literally meaning enough books to make the pack-ox sweat and to fill a building to the rafters; used to describe an immense number of books or a massive library.

References

variant 汗牛充栋/汗牛充棟 充栋汗牛/充棟汗牛