Longman Dictionary of Contemporary English homepage

abreast

 adverb
     
a‧breast
1

keep/stay abreast of something

to make sure that you know all the most recent facts or information about a particular subject or situation:
It's important to keep abreast of the latest developments in computers.
2

walk/ride etc abreast

to walk, ride etc next to each other, all facing the same way
two/three/four etc abreast (=with two, three, four etc people or vehicles next to each other)
The planes were flying four abreast.
3 level with someone or something or in line with them:
As the car drew abreast of him, Jack suddenly recognised the driver.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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