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Verb: perk up
  1. Gain or regain energy
    - perk, percolate, pick up, gain vigor [US], gain vigour [Brit, Cdn]
  2. Cause to be alert and energetic
    - stimulate, arouse, brace, energize, energise [Brit]

Derived forms: perked up, perking up, perks up

Type of: affect, convalesce, recover, recuperate