From Wiktionary, the free dictionary
| For pronunciation and definitions of ませんてっけん – see the following entry.
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| 【磨穿鉄硯】
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- [noun] showing unyielding diligence in one's studies; wearing a hole through one's metal inkstone from constant studying
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| (This term, ませんてっけん (masentekken), is the hiragana spelling of the above term.)
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