n the gist [sing] main point or general meaning (of sth spoken or written) 主旨; 要点; 大意
*get (ie understand) the gist of an argument, a conversation, a book 理解一场辩论、一次谈话、一部书的主旨.
[Date: 1700-1800; Language: Anglo-French;Origin:'it lies, it can be presented in a court of law', from Old French gesir 'to lie']
the main idea and meaning of what someone has said or written
the gist of
The gist of his argument is that full employment is impossible.
Don't worry about all the details as long as you get the gist (=understand the main meaning) of it.