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"
Side by side, facing forward.
alongside each other, facing in the same direction
Side by side and facing forward.
Abreast of; alongside.
The word "abreast" comes from Middle English abrest, formed by combining "a-" (meaning on or at) with "breast." Its original sense was having breasts in line, indicating that people or things were side-by-side and equally advanced.