開口 [ㄎㄞ ㄎㄡˇ; kai1 kou3]
  to open one's mouth
  to start to talk
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  開口
  かいこう
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  opening
  aperture (e.g. camera)
  opening one's mouth
  beginning to speak
  noun or verb acting prenominally (other than the above)
  open
  broad
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