From WordNet (r) 3.0 (2006):
amplify
v 1: increase in size, volume or significance; "Her terror was
magnified in her mind" [syn: magnify, amplify]
2: to enlarge beyond bounds or the truth; "tended to romanticize
and exaggerate this `gracious Old South' imagery" [syn:
overstate, exaggerate, overdraw, hyperbolize,
hyperbolise, magnify, amplify] [ant: downplay,
minimise, minimize, understate]
3: exaggerate or make bigger; "The charges were inflated" [syn:
inflate, blow up, expand, amplify]
4: increase the volume of; "amplify sound"