If you read up on a subject, you read a lot about it so that you become informed about it.
I’ve read up on the dangers of all these drugs.
PHRASAL VERB : V P P n
If you read up on a subject, you read a lot about it so that you become informed about it.
I’ve read up on the dangers of all these drugs.
PHRASAL VERB : V P P n
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006