1
general::
Stay or cause to stay up-to-date with, as in He's keeping abreast of the latest weather reports, or Please keep me abreast of any change in his condition. This term alludes to the nautical sense of abreast, which describes ships keeping up with each other. [Late 1600s]
American Heritage Idioms
2
general::
Phrase(s): keep abreast of someone or something
Go to abreast of someone or something.
McGrawhill's American Idioms And Phrasal Verbs