De-energize means to remove energy or power from something. Antonyms for de-energize can be words that suggest the opposite, such as energize, activate, power up, charge, or electrify. Energize means to provide energy or power to something or someone, to give strength or enthusiasm. Activate suggests turning something on, starting it up or bringing it to life. Power up means to supply power or energy to something, to cause it to start working. Charge means to provide energy to something through a battery or electrical outlet, while electrify means to give a powerful shock or jolt of energy to something.