Used in a legal context, 'quash' implies a precise, authoritative action, often by a court or judge. After reviewing the new evidence, the judge moved to quash the previous verdict.
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Power of Authority
'Quash' conveys a sense of finality when an official body nullifies an action or decision. The committee voted unanimously to quash the proposed policy change.
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Irrevocability
The act of quashing something in a legal context is typically irreversible. Once the conviction was quashed, there was no further recourse.