1. to stop a machine, especially a computer, by turning off the electricity supply
   • ● We were told to power down at 9.45.
   • ● Log off or power down your system.
   • ● Do not power off or reboot in the middle of the update.
   • ● Power off your PC.
   Antonym : power something up, power something up related noun power-down

[TahlilGaran] English Dictionary ▲

1. a time when a machine or system stops working
   • ● a power-down of the whole building
   • ● The internal clock and date were not stored after power-down.

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[TahlilGaran] English Dictionary ▲