amplify

(verb) increase in size, volume or significance. Synonyms: magnify. Example: "Her terror was magnified in her mind."

(verb) to enlarge beyond bounds or the truth. Synonyms: overstate, exaggerate, overdraw, hyperbolize, hyperbolise, magnify. Example: "Tended to romanticize and exaggerate this `gracious old south' imagery."

(verb) exaggerate or make bigger. Synonyms: inflate, blow up, expand. Example: "The charges were inflated."

(verb) increase the volume of. Example: "Amplify sound."