1. (

• overturn ,
• turn_over ,
• tip_over ,
• tump_over ,

) turn from an upright or normal position; "The big vase overturned"; "The canoe tumped over" ;

2. (

• overturn ,
• tip_over ,
• turn_over ,
• upset ,
• knock_over ,
• bowl_over ,
• tump_over

) cause to overturn from an upright or normal position; "The cat knocked over the flower vase"; "the clumsy customer turned over the vase"; "he tumped over his beer" ;

3. (

• overrule ,
• overturn ,
• override ,
• overthrow ,
• reverse

) rule against; "The Republicans were overruled when the House voted on the bill" ;

4. (

• overthrow ,
• subvert ,
• overturn ,
• bring_down

) cause the downfall of; of rulers; "The Czar was overthrown"; "subvert the ruling class" ;

5. (

• revoke ,
• annul ,
• lift ,
• countermand ,
• reverse ,
• repeal ,
• overturn ,
• rescind ,
• vacate

) cancel officially; "He revoked the ban on smoking"; "lift an embargo"; "vacate a death sentence" ;

6. (

• revolutionize ,
• revolutionise ,
• overturn

) change radically; "E-mail revolutionized communication in academe" ;