assertion : Idioms & Phrases

• noun the act of putting forth your own opinions in a boastful or inconsiderate manner that implies you feel superior to others
  
• noun the act of asserting yourself in an aggressive manner
  

WordNet

Self`-as*ser"tion noun

Definitions

1. The act of asserting one's self, or one's own rights or claims; the quality of being self-asserting.

Webster 1913

• etc., to detect and expose it, so as to put a stop to its currency; an expression probably derived from the former practice of shopkeepers, who were accustomed to nail bad or counterfeit pieces of money to the counter.

Webster 1913