To soliloquize means to talk to yourself, especially in a play or a story, when the character speaks their thoughts out loud.
Soliloquizing can show that a character is thinking deeply or feeling very strong emotions.
Examples:
She soliloquized about her plans for the future.
In the story, the main character soliloquized about his fears.
He soliloquized quietly to himself in the empty room.
The cat soliloquized about the birds outside.
The king soliloquized loudly about his anger and sadness.
The actor soliloquized on the stage, and everyone listened.