Also found in: Dictionary, Thesaurus, Medical, Legal, Acronyms, Encyclopedia, Wikipedia.
power something up
to start something, such as an engine. You should power the engine up and let it run awhile before you drive away. Power up the engine and mow the grass.
to start an engine. Well, let's power up so we will be ready to leave with the others. It's time to power up and get going.
1. To activate some device and prepare it for operation: The pilot powered up the engines and prepared to take off. I replaced the memory chip and powered the computer up and to see if it worked.
2. To start operating and become ready for use: Wait a few seconds for the computer to power up.