神出鬼沒

shénchūguǐmò

come and go like a shadow; appear and disappear mysteriously.

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shen2 chu1 gui3 mo4

lit. Gods appear and devils vanish (idiom); to appear and disappear unpredictably, to change rapidly

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神出鬼沒|神出鬼没 [shén chū guǐ mò] ► lit. Gods appear and devils vanish (idiom); to appear and disappear unpredictably ► to change rapidly