quash 
/ˈkwɑ:ʃ/ verb
quash·es; quashed; quash·ing /ˈkwɑ:ʃ/ verb [+ obj] 1 : to stop (something) from continuing by doing or saying something
▪ The riot was quashed by police. ▪ The couple quashed rumors that they were engaged. 2 law : to decide that (a ruling, decision, etc.) is wrong and no longer valid
▪ The judge quashed [=overturned] the verdict of the lower court and ordered a new trial.
▪ The riot was quashed by police. ▪ The couple quashed rumors that they were engaged.
▪ The judge quashed [=overturned] the verdict of the lower court and ordered a new trial.
