So, "what does the world avail" essentially means:
* What good is the world?
* What does the world offer me?
* What benefit do I gain from the world?
It implies a sense of disillusionment or resignation about the world's ability to provide happiness or fulfillment.
This phrase is often used in a rhetorical way, expressing a feeling of despair or frustration with the state of the world.
For example:
* "What does the world avail, when all my loved ones are gone?"
* "What does the world avail, when I am surrounded by suffering?"