Adopting
When an instructor adopts an OER, they use an OER as-is in their course to replace high-cost materials.
Adopting an OER means that an instructor is integrating Open Educational Materials into their courses without significant revisions, similar to adopting and integrating any new textbook into an existing course. The difference here is that when adopting OER, there is no publisher support.
The work of adopting OER includes creating or finding supplementary and ancillary materials for students. There are many resources online you can adopt and adapt, but this is added onto the work of finding and evaluating an OER textbook for a course.