Energize means to raise the energy level of something. If your really boring teacher suddenly starts throwing M&Ms to every student with a correct answer, he will energize the classroom.

Ever seen the Energizer Bunny––the one who "keeps going and going and going?" It's because he's energized by long-lasting batteries that he has the energy to beat that drum over and over. Someone who's feeling low on energy might be reenergized by a cat nap or a candy bar.

Definitions of energize
  1. verb
    cause to be alert and energetic
    synonyms: arouse, brace, energise, perk up, stimulate
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    calm, sedate, tranquilize, tranquillise, tranquillize
    cause to be calm or quiet as by administering a sedative to
    de-energise, de-energize
    deprive of energy
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    inject with libidinal energy
    animate, quicken, reanimate, recreate, renovate, repair, revive, revivify, vivify
    give new life or energy to
    invigorate, reinvigorate
    impart vigor, strength, or vitality to
    animate, enliven, invigorate, liven, liven up
    make lively
    ginger up, jazz up, juice up, pep up
    make more interesting or lively
    inspirit, spirit, spirit up
    infuse with spirit
    type of:
    act physically on; have an effect upon
  2. verb
    raise to a higher energy level
    synonyms: energise, excite
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    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
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