出沒 [ㄔㄨ ㄇㄛˋ; chu1 mo4]
  to vanish and reappear
  rising and setting (of the sun)
  a haunt (of hidden creatures)
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  出没
  しゅつぼつ
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  appearing frequently
  infesting
  appearance and disappearance
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