kill switch

[ kil-swich ]
/ ˈkɪl ˌswɪtʃ /

noun

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.

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Origin of kill switch

First recorded in 1950–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020