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.
(..) A home...family... ...Iove. Men speak conveniently of love when it serves their purpose. When it doesn't, 'tis a burden to them. Robin of the Hood... ...Prince of Thieves... ...is he capable of love? Father! It's Mother, she's dying! (..)1991 Robin Hood: Prince of Thieves
(..) Tell the Sheriff for every harm he does these people I will repay him tenfold. Something vexes thee? What the devil? It's a hot day, friend... ...to burden your horse with such a heavy purse. The Sheriff will hear of this! I truly hope so. Buy yourself a new sow. God bless you, Fanny. (..)1991 Robin Hood: Prince of Thieves