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

) declare invalid; "The contract was annulled"; "void a plea" ;