Out of the blue = repentinamente; do nada.
He just appeared out of the blue.
He just appeared out of the blue.
(Ele simplesmente apareceu do nada.)
It just happened out of the blue.
It just happened out of the blue.
(Simplesmente aconteceu do nada.)
One night, out of the blue, he knocked on my door.
One night, out of the blue, he knocked on my door.
(uma noite, do nada, ele bateu na minha porta.)
She arrived out of the blue.
She arrived out of the blue.
(Ela chegou repentinamente.)
