verb

intensify, increase, or further improve the quality, value, or extent of.

his refusal does nothing to enhance his reputation

increase,add to,intensify,magnify,amplify,inflate,strengthen,build up,supplement,augment,boost,upgrade,raise,lift,escalate,elevate,exalt,aggrandize,swell,improve,enrich,complement,heighten,deepen,stress,reinforce,underline,emphasize,jack up,hike