鑽故紙堆

Simplified: 钻故纸堆

zuāngùzhǐduī ㄗㄨㄢ ㄍㄨˋ ㄓˇ ㄉㄨㄟ

    • to dig into piles of outdated writings (idiom) to study old books and papers

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
to burrow into a heap of old paper
Meaning
To bury oneself in old books and documents, especially ancient texts. Often said with mild mockery of a scholar cut off from the real world.

Sources