S: (v) enrich (make better or improve in quality) "The experience enriched her understanding"; "enriched foods"
S: (v) build up, develop (change the use of and make available or usable) "develop land"; "The country developed its natural resources"; "The remote areas of the country were gradually built up"
S: (v) turn around (improve dramatically) "The new strategy turned around sales"; "The tutor turned around my son's performance in math"
S: (v) help (improve; change for the better) "New slipcovers will help the old living room furniture"
S: (v) upgrade (to improve what was old or outdated) "I've upgraded my computer so I can run better software"; "The company upgraded their personnel"
S: (v) condition (put into a better state) "he conditions old cars"
S: (v) emend (make improvements or corrections to) "the text was emended in the second edition"
S: (v) purify, sublimate, make pure, distill (remove impurities from, increase the concentration of, and separate through the process of distillation) "purify the water"
S: (n) chemistry, chemical science (the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions)
S: (v) disentangle, unsnarl, straighten out (extricate from entanglement) "Can you disentangle the cord?"
S: (v) reform, straighten out, see the light (change for the better) "The lazy student promised to reform"; "the habitual cheater finally saw the light"