WordNet (r) 3.0 (2006):

hyperbolise
    v 1: 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]