How to Say "to soundproof" in Spanish
The Spanish word for “to soundproof” is “aislar” — B2 level.
English → SpanishB2
verbB2
blocking noise
Examples
Necesitamos aislar las ventanas para el invierno.
We need to insulate the windows for the winter.
Este material sirve para aislar el ruido exterior.
This material is used to soundproof external noise.
Aísla bien los cables para evitar un cortocircuito.
Insulate the cables well to avoid a short circuit.
Using 'contra'
When talking about insulation, you can use 'contra' (against) to specify what you are blocking, like 'aislar contra el frío'.
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