汗牛充栋汗牛充棟

hàn niú chōng dòng

Meaning

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

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Characters

汗hànperspiration, sweat氵干牛niúox, cow, bull 充chōngto fill, to supply; to be full亠允栋dòngridge-beam; the main support of a house木东