effacement
  抹消;抹殺;削除
  ef·face·ment /ɪˈfesmənt, ɛ-/ 名詞
  Ef·face·ment n.  The act if effacing; also, the result of the act.
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  effacement
       n 1: shortening of the uterine cervix and thinning of its walls
            as it is dilated during labor
       2: withdrawing into the background; making yourself
          inconspicuous [syn: self-effacement]