How to Say "tattletale" in Spanish
The Spanish word for “tattletale” is “soplón” — B1 level.

Examples
No seas un soplón; mi secreto está a salvo contigo, ¿verdad?
Don't be a snitch; my secret is safe with you, right?
La policía atrapó a los criminales gracias a un soplón dentro de la banda.
The police caught the criminals thanks to a snitch inside the gang.
En la escuela, a nadie le gustaba el niño que era un soplón con la maestra.
At school, nobody liked the kid who was a tattletale with the teacher.
The '-ón' Ending
The ending '-ón' is often added to verbs to describe a person who does that action a lot. Here, it comes from 'soplar' (to blow/whisper).
Gender Changes
While this entry is for the masculine 'soplón', if you are talking about a female, you must add an 'a' and remove the accent: 'soplona'.
Don't use for machines
Mistake: “Using 'soplón' to describe a leaf blower or a fan.”
Correction: Use 'soplador' for a leaf blower and 'ventilador' for a fan. 'Soplón' is only for people.
Related Translations
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