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磨穿鉄硯 ませんてっけん masentekken

JMdict entry #2838551

  1. noun (common) (futsuumeishi) yojijukugo showing unyielding diligence in one's studies; wearing a hole through one's metal inkstone from constant studying

Kanji in this word

grind, polish, scour
穿
put, on, (to
iron
inkstone

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