se mirent à

began to

→ se
phrase Rare #25,920
began to A literary or narrative past-tense form of « se mettre à », used with a plural subject to indicate that someone or something started doing something.
FR: À la tombée de la nuit, les oiseaux se mirent à chanter.
EN: At nightfall, the birds began to sing.

Toutes les deux se mirent à rire.

They both started laughing.

Toutes deux se mirent à pleurer.

Both of them began to cry.

Ils se mirent à construire une maison.

They began to build a house.

Vint l'automne et les feuilles se mirent à tomber.

Autumn came, and the leaves began to fall.

Tous deux se mirent à rire.

They both started laughing.

Les gens se mirent à apprécier ses tableaux.

People began to appreciate his paintings.

Toutes deux se mirent à rire.

Both of them started laughing.

Ils se mirent à rire.

They started laughing.

— Le Guépard (1963)

Les filles se mirent à pleurer après avoir lu le roman.

The girls started to cry after reading the novel.

Ils se mirent à vous observer.

They began to observe you.

— L'Accusé (2017)

L'automne arriva et les feuilles se mirent à tomber.

Autumn arrived, and the leaves began to fall.

Les deux jeunes filles se mirent à pleurer.

The two girls began to cry.

Tout à coup les bombes ennemies se mirent à pleuvoir sur nous.

Suddenly enemy bombs began to rain down on us.