intensify
in.ten.si.fy \in-'ten(t)-s*-.fi-\ vt 1: to make intense or more intensive : STRENGTHEN 2a: to increase the density and contrast of (a photographic image) by chem ical treatment 2b: to make more acute : SHARPEN : to become intense or more intensive : grow stronger or more acute to increase markedly in measure or degree. INTENSIFY implies a deepening or strengthening of a thing or of its characteristic quality; AGGRAVATE implies an increasing in gravity or seriousness, esp. the worsening of something already bad or undesirable; HEIGHTEN suggests a lifting above the ordinary or accustomed; ENHANCE implies a raising or strengthening above the normal in desirability, value, or attractiveness SYN syn INTENSIFY, AGGRAVATE, HEIGHTEN, ENHANCE mean
Webster's English Dictionary