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"¡Bah!" is an interjection which is often translated as "Bah!", and "no sé" is a phrase which is often translated as "I don't know". Learn more about the difference between "¡Bah!" and "no sé" below.
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
