1. Third person singular preterite of quebrar-se; to break, to snap, or to shatter (reflexively)
The glass broke when it fell on the floor.
O copo quebrou-se quando caiu no chão.
3. Figuratively: to lose one's composure or emotional strength
She broke down crying after hearing the news.
Ela quebrou-se em lágrimas ao ouvir a notícia.