Here's a breakdown:
* muli - again, anew
* gamitin - to use
You can also use gamitin muli which literally translates to "use again".
Here are some examples of how to use these words in a sentence:
* Muling gamitin natin ang mga lumang bote para sa pagtatanim ng halaman. (Let's reuse the old bottles for planting.)
* Gamitin muli ang papel na ito para sa pagsulat. (Reuse this paper for writing.)