Often uncountable in the sense of repeated exchange or movement; plural back-and-forths is also possible for individual instances.
The boat's back-and-forth made several passengers seasick.
Le va-et-vient du bateau a rendu plusieurs passagers malades du mal de mer.
échangeDans le contexte d’une discussion ou de messages. Usually used attributively before a noun.
They watched the back-and-forth motion of the swing.
Ils ont regardé le mouvement à va-et-vient de la balançoire.
de va-et-vientPour un échange répété d’arguments, de remarques ou d’actions. Adverbial use exists, though the spelling back and forth is often more common.
The child moved back-and-forth across the room.
L’enfant s’est déplacé d’un côté à l’autre de la pièce.
Synonyms
back and forth
to and fro
forth and back
backwards and forwards
backward and forward
from side to side
again and again