WordWeb Online

1. Spur on or encourage especially by cheers and shouts
   - cheer, root on, inspire, urge, barrack, urge on, exhort
    
2. Make more interesting or lively
   "pep up your paper";
   - jazz up, juice up, ginger up

Derived forms: pepped up, peps up, pepping up

Type of: animate, encourage, enliven, invigorate, liven, liven up