Off the Subject is an idiom that means to talk about something unrelated to the current topic of conversation. The two crossword solutions for this term are AFIELD (6 letters) and NEITHERHERENORTHERE (19 letters). AFIELD is defined as 'at a distance, away from the usual place or sphere of activity'. NEITHERHERENORTHERE is defined as 'not in either of two places; not here or there'. Both of these terms can be used to describe a conversation that has gone off the subject, as it is no longer in the usual place or sphere of activity, and is not related to either of the two topics being discussed.