ils tombaient

were falling, fell

→ tomber
tomb to fall + aient imperfect tense, they
verb · third plural · imperfect indicative Rare #42,978
were falling, fell Imperfect tense (used for an ongoing/repeated past action or background description).
FR: Les feuilles tombaient des arbres en automne.
EN: The leaves were falling from the trees in autumn.
Conjugation of tomber
Indicative imperfect
SingularPlural
Third tombait tombaient

Les feuilles tombaient sur le sol.

The leaves fell to the ground.

Même quand les bombes tombaient.

Even when the bombs were falling.

— La Légende du pianiste sur l'océan (1998)

Les feuilles tombaient au sol sans faire de bruit.

The leaves fell to the ground without making a sound.

Et ils tombaient.

And they were falling.

— Benni (2019)