forth-and-back

Переводы
туда и обратно
взад и вперёд
туда-сюда
туда-обратно
Определения
Moving or extending in one direction and then back in the opposite direction.
Going from one place to another and then returning.
Moving repeatedly between two places or positions.
Слова
forth

наречие
туда
and

союз
и
back

наречие
обратно