The phrase "to absorb the oil" means to soak up or take in the oil. It refers to the process of removing or sucking up the oil from a surface or substance.
Sentences with «to absorb the oil»
Transfer the cooked slices onto kitchen paper to help absorb the oil. (whereismyspoon.co)
This is unlikely, though, since skin absorbs the oil very quickly. (health.com)
The skin easily absorbs this oil and has many long lasting benefits. (thankyourbaby.com)