keep abreast vs keep up

keep abreast and keep up both are verbs.

Word	Noun	Adjective	Verb	Adverb
keep abreast	No	No	Yes	No
keep up	No	No	Yes	No

As verbs, keep abreast and keep up are synonyms defined as:

Other synonyms of keep abreast include follow.

keep abreast (verb)	keep up (verb)
keep informed	prevent from going to bed at night
	keep informed
	maintain a required pace or level
	keep in safety and protect from harm, decay, loss, or destruction
	lengthen or extend in duration or space