main subject; main discourse; body of an argument
Refers to the central topic or the main part of a speech, essay, or discussion, as opposed to the introduction or conclusion.
Let's stop the preliminaries and get to the main subject.
In the body of the paper, the author presents three pieces of evidence.
this subject; the matter at hand
Used to refer to the topic currently under discussion, often in formal or written contexts. Can be replaced by 本題 in many cases.
Returning to the matter at hand, please share your thoughts on the earlier proposal.
this thesis; this article; the article under consideration
Compound of 本 (main) and 論 (argument, discourse). The reading ほんろん is the standard on'yomi combination.