- a button, switch, or other mechanism that allows a machine to be shut down immediately:Only use the kill switch in emergencies.
- Digital Technology. a command deployed to remotely lock, disable, or wipe an electronic device, as when the device is lost or stolen.
Origin of kill switch
First recorded in 1950–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018