override

Noun

• the act of nullifying; making null and void; counteracting or overriding the effect or force of something

• a manually operated device to correct the operation of an automatic device

Verb

• ride (a horse) too hard

• counteract the normal operation of (an automatic gear shift in a vehicle)

• prevail over
  • health considerations override financial concerns
    

• rule against
  • The Republicans were overruled when the House voted on the bill
    

Related words

• Synonyms: 
  nullification , overrule , overturn , overthrow , reverse