How to Say "omen" in Spanish
The most common Spanish word for “omen” is “anuncio” — use 'anuncio' when referring to a sign or indication of a future event that is often more formal or official, like a public statement or a forecast..
anuncio
ah-NOON-syoh/aˈnunθjo/

Examples
El cielo nublado es un anuncio de lluvia.
The cloudy sky is an omen of rain.
El presidente hará un anuncio importante esta tarde.
The president will make an important announcement this afternoon.
El anuncio de su boda sorprendió a todos sus amigos.
The announcement of their wedding surprised all their friends.
Action vs. Result
This definition emphasizes the act of notifying or declaring something. If you are talking about the written notice or sign itself, you might use aviso.
mensajero
/men-sa-JERO//men.saˈxe.ɾo/

Examples
La aparición del cometa fue vista como un terrible mensajero.
The comet's appearance was seen as a terrible omen.
Las golondrinas son mensajeros de la primavera.
Swallows are harbingers of spring.
La caída de la bolsa fue un mensajero de la crisis económica.
The stock market crash was a precursor to the economic crisis.
Figurative Use
In this context, 'mensajero' doesn't refer to a person, but to an object or event that 'carries' information or warns you about what will happen next.
Anuncio vs. Mensajero
Related Translations
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