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to read up on something
01
to extensively read on a specific topic to gain more knowledge or understanding
![to [read] up (on|about) {sth} definition and meaning](https://cdn.langeek.co/photo/46551/original/?type=jpeg "to [read] up (on|about) {sth} definition and meaning")
Exemples
To better understand the economic theories discussed in class, I spent hours reading up on the subject in the library.
