on s'amusait

we were having fun

→ on
phrase Rare #36,084
we were having fun On usually means “we” in everyday French; the imperfect can describe an ongoing or habitual past action.
FR: On s'amusait beaucoup à la fête.
EN: We were having a lot of fun at the party.

Et si on s'amusait un peu ?

How about we have a little fun?

On s'amusait tellement qu'on n'a pas vu le temps passer.

We were having so much fun that we didn’t notice the time passing.

On s'amusait tellement à la fac.

We had so much fun at college.

— Us and Them (2018)

Je croyais qu'on s'amusait bien.

I thought we were having fun.

On s'amusait bien.

We had a great time.

On s'amusait, c'est tout.

We were just having fun.

Après, on allait dans la rue et on s'amusait comme des gosses.

Afterward, we’d go out into the street and have fun like kids.

— Douleur et gloire (2019)

On s'amusait bien, à Paris.

We were having a great time in Paris.

— Out of It (1978)

On s'amusait.

We were having fun.