Üçü yan yana yürüyorlardı. - They were walking three abreast.
Onlar yan yana yürüyordu. - They were walking two abreast.
الإنجليزية - الإنجليزية
تعريف abreast of في الإنجليزية الإنجليزية القاموس.
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"
If people or things walk or move abreast, they are next to each other, side by side, and facing in the same direction. The steep pavement was too narrow for them to walk abreast