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
     
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
Advanced Learner's Dictionary.

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