To sebate means to lessen or reduce something, especially something bad or harmful.
When something is sebated, it usually becomes better or less bad.
Examples:
She sebated the pain with medicine.
We need to sebate the amount of trash we make.
The doctor sebated the fever with medicine.
I sebated the number of cookies I ate today.
He sebated the noise by closing the window.
The teacher sebated the amount of homework we had to do.