|Origin:||quasser, from Late Latin cassare, from Latin cassus 'having no effect, void'|
|Origin:||quasser, from Latin quassare 'to shake violently, break'|
quash [transitive] formal
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.
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.