(Translated by https://www.hiragana.jp/)
投閒置散 - Wiktionary, the free dictionary

とうあいだおけ

Chinese

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to throw; to send idle; interstice; separate to install; to place; to put
adjourn; scatter; leisurely
adjourn; scatter; leisurely; loosen; powdered medicine; to scatter; to come loose
 
trad. (とうあいだおけ/とう閑置) とう あいだ/ おけ
simp. (とう闲置) とう おけ

Pronunciation

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Idiom

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とうあいだおけ

  1. to assign to an unimportant position