…Usually a manifestation of insecurity, fear of the danger, or the feeling of a calamity. Other times it reflects the desire for freedom from oppression we cannot endure any longer, but if it comes to melee it symbolizes internal conflicts. Whatever the outcome of the fight (quarrel, war, lynching, fight, tournament) that’s what will happen in reality….
Dream dictionary: Lynching dream meanings
If you saw the lynching in a dream, then such dream shows the shame you have about something. Perhaps there is something you did, which now you feel guilty.