Someone or something has disappeared and its whereabouts are unknown.
向方向。不知道哪里去了。
明·冯梦龙《东周列国志》第一回宣王问曰‘如今红衣小儿何在？’答曰‘自教歌之后，不知去向。’”
After the party, my keys were gone, and I had no idea where they went.
Learn the next connected idiom: 不知去向 (bù zhī qù xiàng) → 相辅相成 (xiāng fǔ xiāng chéng)
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