amplify

Verb
  1. Increase in size, volume or significance (synset 200435030)
    "Her terror was magnified in her mind"
  2. To enlarge beyond bounds or the truth (synset 200841513)
    "tended to romanticize and exaggerate this `gracious Old South' imagery"
  3. Exaggerate or make bigger (synset 200265272)
    "The charges were inflated"
  4. Increase the volume of (synset 200264790)
    "amplify sound"

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