The 'burden of proof' is on the plaintiff, since the defendant is presumed innocent until proven guilty. [=the plaintiff must prove that the defendant is guilty]
The 'tax burden' has been falling increasingly on the middle class. [=middle class people have been paying a greater portion of taxes]
For the rest of his life he 'was burdened' with the knowledge that he had done nothing to help them.
(..) Come here. (BELL TOLLING) Why did you look at me that way? In that fashion? (SOFTLY) Why should you pity me? I think you carry a terrible burden. And you carry it alone. (INDISTINCT CHATTERING) (CHICKENS CLUCKING) - Halt, my Lady! Come with us! - No! Let go! (..)2016 TvShow: Vikings Title: Portage Season: 4 Episode 8