Learner's definition of ABREAST
—
used to describe two or more people or things that are next to each other in a line（两个或更多的人或物）并排，并肩
abreast of
1
: next to (someone or something)与…并排；靠拢 2
: aware of or informed about (new occurrences, facts, etc.)了解（最新情况）；跟上（最新进展）