退行 [ㄊㄨㄟˋ ㄒㄧㄥˊ; tui4 xing2]
  to recede
  to degenerate
  to regress
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  退行
  たいこう
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  nouns which may take the genitive case particle `no'
  retrogression
  regression
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