If something relieves an unpleasant feeling or situation, it makes it less unpleasant or causes it to disappear completely.

If someone or something relieves you of an unpleasant feeling or difficult task, they take it from you.

If someone relieves you of something, they take it away from you.

If you relieve someone, you take their place and continue to do the job or duty that they have been doing.

If someone is relieved of their duties or is relieved of their post, they are told that they are no longer required to continue in their job.

If an army relieves a town or another place which has been surrounded by enemy forces, it frees it.

If people or animals relieve themselves, they urinate or defecate.