This is the 4325th most frequent Portuguese word.
ameaçou
"Ameaçou" means "threatened" in English.
Ameaçou here signifies the act of issuing a threat or warning about some action to be undertaken, in this case, telling a secret.
Ele ameaçou contar o segredo de Ana para a turma.
He threatened to tell Ana's secret to the class.
Ameaçou in this instance describes the indication or risk of something potentially happening, like rain.
O céu escureceu e ameaçou chover durante a tarde.
The sky darkened and threatened to rain during the afternoon.
Ameaçou is used to express the act of enforcing compliance through the use of a threat of consequence, for disciplinary actions in this context.