quashing

1. put down by force or intimidationExamples: "The government quashes any attempt of an uprising"; "China keeps down her dissidents very efficiently"; "The rich landowners subjugated the peasants working the land"Synonyms: keep down, quash, reduce, repress, subdue, subjugate

2. declare invalidExamples: "The contract was annulled"; "void a plea"Synonyms: annul, avoid, invalidate, nullify, quash, voidAntonyms: validate