"abreast" in the adjective sense
1. abreast, au courant, au fait, up on
being up to particular standard or level especially in being up to date in knowledge
"kept abreast of the latest developments"
"constant revision keeps the book au courant"
"always au fait on the latest events"
"up on the news"
"abreast" in the adverb sense
alongside each other, facing in the same direction
Source: WordNet® (An amazing lexical database of English)
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