1
general::
Phrase(s): Do I have to spell it out (for you)? [and] Do I have to paint (you) a picture?; Do I need to paint you a picture?
Fig. What do I have to do to make this clear enough for you to understand? (Shows impatience.) • Mary: I don’t think I understand what you’re trying to tell me, Fred. Fred: Do I have to spell it out for you? Mary: I guess so. Fred: We’re through, Mary. • Sally: Would you please go over the part about the square root again? Mary: Do I have to paint you a picture? Pay attention!
McGrawhill's American Idioms And Phrasal Verbs