to offer someone relief by freeing them of a burden;
e.g. They rushed to unburden him by taking some of the bags he had been carrying for so long.
(verb)
to cast off one's worries, fears, or cares (figurative burdens) and bring oneself relief, especially by telling someone about things causing one distress or anxiety;
e.g. After a frustrating day, it can be helpful to unburden yourself to a close friend.