How to Say "testify" in Spanish
The Spanish word for “testify” is “declarar” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
verbB1formal
in court

Examples
El testigo tuvo que declarar ante el juez.
The witness had to testify before the judge.
Tienes que declarar todos los regalos que superen los 500 euros.
You have to declare all gifts that exceed 500 euros.
The Preposition 'Ante'
When testifying, you often use the preposition 'ante' (meaning 'before' or 'in the presence of') to say who you are speaking to: 'declarar ante la policía'.
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