amplify in WordNet English dictionary

1. increase in size, volume or significance
   "Her terror was magnified in her mind"
   magnify  amplify 
   
2. increase the volume of
   "amplify sound"
   amplify 
   
3. exaggerate or make bigger
   "The charges were inflated"
   inflate  blow up  expand  amplify 
   
4. to enlarge beyond bounds or the truth
   "tended to romanticize and exaggerate this `gracious Old South' imagery"
   overstate  exaggerate  overdraw  hyperbolize  hyperbolise  magnify  amplify