不知所踪不知所蹤

bù zhī suǒ zōng

Meaning

to vanish without a trace; to go missing

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Characters

不bùno, not, un-; negative prefix一知zhīto know, to perceive, to comprehend矢口所suǒplace, location; "that which", a particle introducing a passive clause户斤踪zōngfootprints, traces, tracks足宗