aug=to increase（增加），to make to grow（使产生；使增大）
*He had the audacity to tell me I was too fat. 他竟然胆敢对我说我太肥胖.
the quality of having enough courage to take risks or say impolite things
have the audacity to do sth
I can't believe he had the audacity to ask me for more money!
1. He had the audacity to go to the party without being invited. 尽管未被邀请，他也敢厚颜地去参加宴会。