To resume the discussion of something (usually something unpleasant or troublesome). A noun or pronoun can be used between "drag" and "up." Can we all please try not to drag up old hurts at this year's Thanksgiving dinner?
drag up
v.
To bring some unpleasant thought or topic back to mind or discussion: Why did you have to drag those old secrets up? The principal dragged up my bad grades from last year.