self-as·ser·tion /-əˈsɝʃən/
  自作主張
  Self-as·ser·tion n. The act of asserting one's self, or one's own rights or claims; the quality of being self-asserting.
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  self-assertion
       n 1: the act of putting forth your own opinions in a boastful or
            inconsiderate manner that implies you feel superior to
            others
       2: the act of asserting yourself in an aggressive manner