power up verb 2power-up noun 1forms 4 verb2 •To turn the electrical power on to a device as a precondition to making it operational.Every morning he powered up his electronic devices, even before making coffee. •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. power-up noun1 •A collectable item that gives the player some benefit.The fist power-up gives you a more powerful punch. formspowered up · powering up · powers up · power-ups