[syn: stimulate, arouse, brace, energize, energise, perk up]
The Collaborative International Dictionary of English v.0.48:
energise \energise\ v. i. & t.
   Same as energize. [mostly British]
   Syn: stimulate, arouse, brace, energize, perk up.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
energise
    v 1: raise to a higher energy level; "excite the atoms" [syn:
         excite, energize, energise]
    2: cause to be alert and energetic; "Coffee and tea stimulate
       me"; "This herbal infusion doesn't stimulate" [syn:
       stimulate, arouse, brace, energize, energise, perk
       up] [ant: calm, de-energise, de-energize, sedate,
       tranquilize, tranquillise, tranquillize]