Longman Dictionary of Contemporary English homepage

Sense: 1
Date: 1200-1300
Language: Old French
Origin: quasser, from Late Latin cassare, from Latin cassus 'having no effect, void'
Sense: 2
Date: 1300-1400
Language: Old French
Origin: quasser, from Latin quassare 'to shake violently, break'

quash

 verb
     
NEW! See related topics: LAW
quash [transitive] formal
1SCLPG to officially say that a legal judgment or decision is no longer acceptable or correct [= overturn]:
The High Court later quashed his conviction for murder.
The decision was quashed by the House of Lords.
2PG to say or do something to stop something from continuing:
A hospital chief executive has quashed rumours that people will lose their jobs.
The government immediately moved to quash the revolt.
Definition from the Longman Dictionary of Contemporary English
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