How to Say "to dismantle" in Spanish
The Spanish word for “to dismantle” is “demoler” — C1 level.
English → SpanishC1
verbC1formal
destroying an argument or theory

Examples
Sus argumentos lograron demoler la defensa del abogado.
His arguments managed to dismantle the lawyer's defense.
El científico demolió la teoría anterior con nuevas evidencias.
The scientist tore apart the previous theory with new evidence.
Abstract Usage
Even though it sounds like construction work, you can use it for ideas. It implies a very thorough, undeniable destruction of a theory or claim.
Related Translations
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