de lourdes pertes

heavy losses

→ de
phrase Rare #43,051
heavy losses Usually refers to major financial losses or many casualties, depending on the context. The adjective lourdes agrees with the feminine plural noun pertes.
FR: L'entreprise a subi de lourdes pertes cette année.
EN: The company suffered heavy losses this year.

De lourdes pertes.

Heavy losses.

— Guerre et Paix (1968)

Il a souffert de lourdes pertes.

He suffered heavy losses.

Mais on enregistre de lourdes pertes chaque fois qu'on y envoie nos forces.

But we suffer heavy losses every time we send our forces there.

— Avatar : La Voie de l'eau (2022)

Si ton plan avait réussi, nous aurions subi de lourdes pertes.

If your plan had succeeded, we would have suffered heavy losses.

— Le Secret des poignards volants (2004)