The term 'TOUCH ON' can be solved by the crossword solutions of MENTION (7 letters), ABUT (4 letters), and BORDER (6 letters). MENTION means to refer to something briefly in speech or writing. ABUT means to be adjacent to or to BORDER on something. BORDER means to form an outer edge or boundary of something. Therefore, the term 'TOUCH ON' can be interpreted as referring to something briefly, being adjacent to something, or forming an outer edge or boundary of something.