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.
(..) So whose turn is it? Whose go is it? -( Huffs ) - ( people chattering ) "On a bed of nails rests the burden of blame. Thou must confess thy secret shame." I don't know. Uh... okay, look, there's no right way (..)2009 The Black Waters of Echo's Pond