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不知所终 - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

For pronunciation and definitions of 不知所终 – see 不知所終 (“to not know what has become of someone; to not know someone's whereabouts; to not know what happened to someone”).
(This term is the simplified form of 不知所終).

Notes:

Simplified Chinese is mainly used in Mainland China, Malaysia, and Singapore.
Traditional Chinese is mainly used in Hong Kong, Macau, and Taiwan.