- (adverb when intr, often foll by on) to acquire information about (a subject) by reading intensively
Idioms and Phrases with 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]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.