'de-energize' definitions:

Definition of 'de-energize'

From: WordNet
verb
Deprive of energy [syn: de-energize, de-energise] [ant: arouse, brace, energise, energize, perk up, stimulate]

Definition of 'de-energize'

From: GCIDE
  • de-energize \de-energize\ v. t. to deprive of energy, especially electrical energy; the door locks were de-energized and opened manually. [WordNet 1.5]