What is the meaning of Peter's dream?

If you are asking about the Apostle Peter's vision in Acts, chapter 10, it is understood to be the command of Christ to open the gospel to the Gentiles. In other Words, it meant that Peter, and by extension the other Apostles, should not limit their evangelism only to Jews, but take it to the entire world. Peter himself gives his vision this interpretation in Acts 11: 1 - 18.