"quash" in the verb sense
1. repress, quash, keep down, subdue, subjugate, reduce
put down by force or intimidation
"The government quashes any attempt of an uprising"
"China keeps down her dissidents very efficiently"
"The rich landowners subjugated the peasants working the land"
2. invalidate, annul, quash, void, avoid, nullify
"The contract was annulled"
"void a plea"
Source: WordNet® (An amazing lexical database of English)
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