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Verb: buoy up
  1. Become more cheerful
    - lighten, lighten up
     
  2. Make more cheerful
    - lighten, lighten up
     
  3. Keep afloat
    - buoy

Derived forms: buoyed up, buoying up, buoys up

Type of: cheer, cheer up, chirk up, hold, hold up, support, sustain