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boot up

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Start a computer, as in When you've booted up, it's best not to turn off the computer until you're done for the day. The term, dating from the late 1970s, was a shortening of bootstrap, another computer idiom referring to using one set of instructions to load another set of instructions. Also see log in.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use boot up in a sentence

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