disburden

To rid of a burden; to free from a load carried; to unload.

to disburden a pack animal

The desert Pelican had built her nest / In that deep solitude. / And now returned from distant flight / Fraught with the river stream, / Her load of water had disburthened there. / Her young in the refreshing bath / Sported all wantonness; […]

To free from a source of mental trouble.

My meditations […] will, I hope, be more […] calm, being thus disburdened.

He did it to disburden a conscience.