de‧ac‧ti‧vate /diːˈæktəveɪt, diːˈæktɪveɪt/
verb [transitive] to switch something off, especially a piece of equipment, or to stop it from being used any more
Antonym : activate:
You need to type in a code number to deactivate the alarm. [TahlilGaran] Dictionary of Contemporary English ▲