From Longman Dictionary of Contemporary Englishpower something ↔ up phrasal verbto make a machine start working Never move a computer while it is powered up. → power→ See Verb table
Examples from the Corpus
power up• He hates the idea of giving up even one day of power.• It was a tentative document that merely asked for provincial legislation enabling municipalities to buy, sell, and distribute electric power.• So, when conversations starts sort of fading, people use questions to power them up.• What we pressed him to do in Committee was to include in the Bill power to set up a funding council.• Once you power them up and get a topic, what you see is people can glide for awhile on that topic.• You use a question to power them back up because it opens up a topic.• The handle of the power mower pokes up intact.• When spending power goes up relatively quickly the long-term growth in property crime slows down.From Longman Business Dictionarypower up phrasal verb1[transitive] power something ↔ up if you power up a computer, you start it2[intransitive] journalismFINANCE if the price of shares etc powers up, it rises very fastThe three-month price for zinc powered up to $1675 a tonne. → power→ See Verb table 