Power-up meaning

To turn the computer on in an orderly manner.
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To turn the electrical power on to a device as a precondition to make it operational.

Every morning he powered up his electronic devices, even before making coffee.

verb
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(intransitive) To become ready for operation as a result of the provision of electrical power.

The office systems power up automatically at 7:30am on workdays.

verb
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(video games) A special item which, when obtained, provides the player with some asset that is necessary for or makes easier the process of beating the game.
noun
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