Manumitting means to free a slave.
Manumitting is a kind and fair thing to do. It means giving freedom to someone who was not free before.
Examples:
The kind man is manumitting the slave.
She is manumitting her servant.
They are manumitting the workers.
The king is manumitting all the slaves in the kingdom.
Manumitting all the animals in the zoo would be strange.
Manumitting the robot was a strange idea.