Back and forth
Meaning: in one direction, then the opposite way, then in the original direction again many times
Example: He has to travel back and forth between London and Paris every week.
Выучи грамотный разговорный английский до уверенного владения всего за 9 месяцев по системе естественного усвоения иностранных языков. Жми!
Example: He has to travel back and forth between London and Paris every week.