汗牛充棟 かんぎゅうじゅうとう Meanings Noun (having, there being) a great number of books Kanji 汗 sweat. Read as カン. 牛 cow. Read as ギュウ. 充 fill. Read as ジュウ. 棟 building. Read as トウ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists