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read up on (something)
To increase one's knowledge of a topic by reading about it. I better read up on this material before I try to teach it tomorrow.
read up (on someone or something)
to find and read some information about someone or something. Please go to the library and read up on George Washington. I don't know anything about that. I guess I need to read up.
Study or learn by reading, as in I don't know much about childhood illnesses, but I can always read up on them. [First half of 1800s]