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English definition of “power (sth) up”

power (sth) up

mainly US
verb uk phrasal verb with power   /paʊər/ us    /paʊɚ/
If something that needs power or energy powers up, or if someone powers it up, it is turned on or prepared so that it is ready for use or action: The computer takes a few seconds to power up after it's been switched on. College baseball teams across the country are powering up for the new season.
(Definition of power (sth) up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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