dilate on (something)
To discuss or write about something at length. I think you need to dilate on this point because it's so important to your argument.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dilate on something
Fig. to speak or write in great detail on some subject. I am sure you do not wish me to dilate further on this matter. If you do not see my point, I would be pleased to dilate on this matter further.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.