on s'était mis d'accord

had agreed

→ on
phrase Rare #37,037
had agreed Used when people had previously reached an agreement.
FR: On s'était mis d'accord pour partir tôt.
EN: We had agreed to leave early.

On s'était mis d'accord sur quoi?

What had we agreed on?

Je croyais qu'on s'était mis d'accord.

I thought we had an agreement.

On s'était mis d'accord, non?

We had agreed on that, hadn't we?

On s'était mis d'accord.

We had agreed.