Idiom Definition:
  
    
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"to have an edge"  
    to have an advantage
     
Synonyms: 
  advance, advancement, advantage, ahead, begin, burst, dash, early, edge, erupt, gain, go, improve, improvement, jump, lead, leg-up, lunge, rush, spring, stampede, superiority
   
   
  
  
One runner has 
gained an edge because his competition is down ... 

see also:
have a head start