高谈阔论
To enlarge oneself.
To prate about.
eg：He loves to enlarge himself in talking about politics.
中英俚语俗语来源：元曲选·贾仲明·玉梳记：“倚仗着高谈阔论，全用些野狐涎扑子弟，打郎君。”
同义词：谈天说地 Talk of everything under the sun.
反义词：欲说还休 To shut up shop.
