once upon a time
US /wʌns əˈpɑːn ə taɪm/
UK /wʌns əˈpɑːn ə taɪm/

1.
érase una vez
used at the beginning of a traditional story to signify that it took place in the distant past
:
•
Once upon a time, there was a beautiful princess who lived in a grand castle.
Érase una vez, una hermosa princesa que vivía en un gran castillo.
•
The storyteller began, "Once upon a time, in a land far away..."
El narrador comenzó: "Érase una vez, en una tierra lejana..."