How to Say "let down" in Spanish
The Spanish word for “let down” is “traicionó” — B1 level.

Examples
Él traicionó la confianza de su mejor amigo.
He betrayed his best friend's trust.
Ella traicionó a su país durante la guerra.
She betrayed her country during the war.
Usted me traicionó cuando más lo necesitaba.
You (formal) let me down when I needed it most.
The Importance of the Accent Mark
The accent on the 'ó' tells you that the action was done by 'he', 'she', or 'it' and that it happened in the past. Without the accent (traiciono), it would mean 'I betray' in the present.
Confusing 'traicionó' with 'traiciono'
Mistake: “Saying 'Él traiciono' instead of 'Él traicionó'.”
Correction: Use 'traicionó' with the accent when talking about what someone else did in the past. Use 'traiciono' only when saying what you are doing right now.
Related Translations
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