It is a command or an imperative statement, urging someone to make positive changes or strive for better performance.
Here are some examples of how it could be used:
* "Pagbutihin mo ang iyong pag-aaral." (Improve your studies.)
* "Pagbutihin mo ang iyong ugali." (Improve your behavior.)
* "Pagbutihin mo ang iyong trabaho." (Do your work better.)
It's a phrase that encourages self-improvement and development.