Often uncountable in the sense of repeated exchange or movement; plural back-and-forths is also possible for individual instances.
Translations
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. Definitions
A repeated movement from one place, side, or direction to another and back again. The boat's back-and-forth made several passengers seasick.
A repeated exchange of remarks, messages, opinions, or arguments between people or groups. The email back-and-forth continued until late evening.
Usually used attributively before a noun.
Translations
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. Definitions
Moving or happening repeatedly in opposite directions or between two places. They watched the back-and-forth motion of the swing.
Involving repeated exchange of remarks, messages, or actions between people or groups. We had a back-and-forth discussion about the proposal.
Adverbial use exists, though the spelling back and forth is often more common.
Translations
The child moved back-and-forth across the room.
L’enfant s’est déplacé d’un côté à l’autre de la pièce.
Definitions
In a repeated movement or exchange from one place, side, or person to another and back again. The child moved back-and-forth across the room.
Synonyms
back and forth
to and fro
forth and back
backwards and forwards
backward and forward
from side to side
again and again