What does derserve mean?

"Derserve" is not a real word in the English language. It seems like you may have misspelled "deserve," which means:

To earn or be worthy of (something, typically something good) because of one's actions or qualities.

For example:

* "He deserves a promotion after all his hard work."

* "She deserves to be happy after everything she's been through."

* "They don't deserve to be treated so poorly."

Let me know if you meant something else or have any other questions!