How to Say "turned witness" in Spanish
The Spanish word for “turned witness” is “arrepentido” — C1 level.

Examples
El testimonio del arrepentido fue clave para cerrar el caso.
The informant's testimony was key to closing the case.
La ley protege a los arrepentidos que colaboran con la justicia.
The law protects turned witnesses who cooperate with the justice system.
Un arrepentido de la mafia reveló los planes del grupo.
A former member of the mafia who turned witness revealed the group's plans.
Nouns from Adjectives
In Spanish, you can often turn an adjective into a noun by adding 'el' or 'la'. Here, 'the sorry person' becomes 'the informant'.
Confusion with 'Soplón'
Mistake: “El arrepentido me dijo el secreto de mi amigo.”
Correction: Use 'soplón' (snitch) for personal secrets; 'arrepentido' is usually reserved for serious legal or criminal situations.
Related Translations
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