perk up

perk up (http://definr.com/perk up)

     v 1: gain or regain energy [syn: perk, percolate, pick up,
          gain vigor]
     2: cause to be alert and energetic; "Coffee and tea stimulate
        me" [syn: stimulate, arouse, brace, energize, energise]
        [ant: de-energize, sedate]