kill switch

noun
🔊/ˈkɪl swɪtʃ/
🔊/ˈkɪl swɪtʃ/
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  1. a switch that can quickly stop a machine working, especially if something goes wrong
    • An emergency kill switch fitted to the engine had helped save the man's life.安装在发动机上的紧急停止开关帮助挽救了该名男子的生命。