JLPT N2Four-character idioms

温故知新

Meaning
昔のことをよく学んでそこから新しい知識や見方を得ること
Explanation
"温故知新", from the sense of looking into the old (故) to learn the new, comes from the Analects. It means studying past knowledge and history well and gaining from it a new perspective useful for the present. It is the exact opposite of c4's "discarding the old"; the point is making use of the old.
Original Japanese explanation

「温故知新」は、故き(古いこと)を温(たず)ねて新しきを知る意で、論語に由来します。過去の知識や歴史をよく学び、そこから現代に役立つ新しい見方を得ることを言います。c4の「古いものを捨てる」とは正反対で、古いものを活かす点が要点です。

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All JLPT N2 words