Taivo A Taiwan Mandarin dictionary

煞有介事

shàyǒujièshì

ㄕㄚˋ ㄧㄡˇ ㄐㄧㄝˋ ㄕˋ

  1. 1to make a show of being very much in earnest (idiom)
  2. 2to act as if one is taking things very seriously

Keep 煞有介事 and it comes back until you know it.

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