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to start up a computer; also, to load an operating system or software program into memory
Most of us pray every time we boot up our computers.
To start up or input a computer'soperatingsystem:Thetypicalfirststepinworking with a computer, then, is to load the DOS programs; this is called ''booting up''/ He showed me how to log in and boot the operating system
[1970s+ Computers; fr earlierbootstrap,becauseafterasimpleactionlikepressing one key, the computer loads the operating system itself, as if it were raising itself by its own bootstraps]