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used item; secondhand item
old; used; previous
「故」 has other readings with different meanings.
故人の遺志を継いで事業を発展させた。
I developed the business by carrying on the deceased's wishes.
故あって彼との連絡は控えることにしました。
Due to certain reasons, I decided to refrain from contacting him.
故郷里先生の功績を称える式典が開かれた。
A ceremony was held to honor the achievements of the late Mr. Sato.