Synonyms for Upgrade (same or very similar meaning)
WordNet sense 1 (an upward slope or grade (as in a road)):
acclivity, ascent, climb, raise, riseWordNet sense 2 (the property possessed by a slope or surface that rises):
rising slopeWordNet sense 3 (give a promotion to or assign to a higher position):
advance, elevate, promote, kick upstairsFrom the ODE community, based on WordNetadd/edit