When someone soothsays, they predict the future or tell what will happen.
Soothsaying is often seen as a mysterious or magical thing.
Examples:
She soothsays that it will rain tomorrow.
The old man soothsays about the coming of a great leader.
He soothsays that we will find a treasure.
The fortune teller soothsays about people's lives.
The wizard soothsays the end of the world.
The soothsayer soothsays the fate of the kingdom.