1. Inflate with air or gas; increase the volume, intensity, or energy of something
   "He pumped up the bicycle tires before the race"; "The DJ pumped up the music as more people entered the club"
    
2. [informal] Praise or promote excessively
   "The marketing team pumped up the new product's features"
    
3. (bodybuilding, fitness) increase the size or definition of muscles through exercise
   "He pumped up his biceps with intense weightlifting"

Derived forms: pumping up, pumped up, pumps up