/ kwɒʃ; NAmE kwɑːʃ/ verb [ vn ]
1.
( law ) to officially say that a decision made by a court is no longer valid or correct
SYN overturn :
His conviction was later quashed by the Court of Appeal.
2.
to take action to stop sth from continuing
SYN suppress :
The rumours were quickly quashed.
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WORD ORIGIN
Middle English : from Old French quasser annul, from late Latin cassare ( medieval Latin also quassare ), from cassus null, void. Compare with squash (verb).