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"Dios mío" is a form of "Dios mío", a phrase which is often translated as "my God". "Oh" is a form of "oh", an interjection which is often translated as "oh". Learn more about the difference between "Dios mío" and "oh" below.
Dios mío(
dyohs
mee
-
oh
)A phrase is a group of words commonly used together (e.g., once upon a time).
c. oh God
¡Dios mío! No me acuerdo de nada de lo que estudié, voy a suspender el examen.Oh God! I don't remember anything I studied. I'm going to fail the exam.
a. my God
¡Dios mío, cómo has cambiado! La última vez que te vi eras solo un niño.My God! Haven't you changed! The last time I saw you, you were just a kid.
d. my goodness
¡Dios mío, estás guapísima con ese vestido!My goodness! You look really beautiful in that dress!
3. (religious)
oh(
oh
)An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
a. oh
Se le ha caído la cartera. Aquí tiene. - ¡Oh, gracias!You dropped your wallet. Here you go. - Oh, thank you!