read up

English

read up (third-person singular simple present reads up, present participle reading up, simple past and past participle read up)

(transitive, intransitive) To learn (about something) by reading.
- 1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019:
  "Pestilential nonsense!" "Have you read it up at all, Father?" asked Enid. "Read it up! I, with all my interests and no time for one-half of them! Enid, you are too absurd." "Sorry, Father."
- 28 November 2009, Indian Express - Nayagan was actor R Madhavan's introduction to Kamal Hassan
  After watching the film, I read up about it in the newspapers. When I came to know that Hassan was a 30-year-old actor then, I was completely awe-struck

When intransitive, it is often constructed as read up on

learn by reading