I swear that
Juro que pensei que fosse morrer na hora.
I swear I thought I was going to die right then and there.
— Cães de Aluguel (1992)
Juro que é verdade ou que me caia um raio em cima.
I swear it's true, or I'll be struck by lightning.
I swear I'll kill whoever it is!
— Ирония судьбы, или С легким паром! (1976)
Por esta mão, juro que desprezo o termo.
By this hand, I swear that I despise the term.
— Henrique V (1989)
I swear I didn't see anything.