Longman Dictionary of Contemporary English homepage

power

2 verb
     
NEW! See related topics: POWER
power2
1 [transitive usually passive] to supply power to a vehicle or machine:
It's powered by a Ferrari V12 engine.
2 [intransitive always + adverb/preposition] to move with a lot of force and speed:
His strong body powered through the water.

power something ↔ up

phrasal verb
to make a machine start working:
Never move a computer while it is powered up.
Definition from the Longman Dictionary of Contemporary English
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