Used predicatively or after verbs like be/go to mean “bankrupt” or “out of money,” chiefly in informal British usage.
After the failed venture, they were completely bust.
Après cette aventure ratée, ils étaient complètement fauchés.
Used attributively before another noun to denote relation to a woman's breasts or bust measurement (e.g., "bust size").
de poitrineEmploi attributif avant un nom. She checked her bust size before ordering the dress.
Elle a vérifié sa taille de poitrine avant de commander la robe.
du busteVariante possible selon le contexte.