rudeness and the quality of being unable to understand that your behaviour or what you say is not acceptable to other people
[ + to infinitive ]Considering that he never even bothers to visit my parents, I'm amazed that Tim has the gall to ask them for money!蒂姆从不去看望我父母，可他竟然有脸去向他们要钱，真让我吃惊！
gall
verb[ T ]uk/ɡɔːl/us/ɡɑːl/
使恼怒，激怒
to make someone feel annoyed
I think it galls him to take orders from a younger and less experienced colleague.我想，要他去听命于一个比他年轻且资历比他浅的同事，他会很恼火。