rectify -
bring, lead, or force to abandon a wrong or evil course of life, conduct, and adopt a right one; "The Church reformed me"; "reform your conduct"
modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"
falsify falsify knowingly; "She falsified the records"
change by reversal,
reverse,
turn change to the contrary; "The trend was reversed"; "the tides turned against him"; "public opinion turned when it was revealed that the president had an affair with a White House intern"
make pure,
purify,
distill,
sublimate remove impurities from, increase the concentration of, and separate through the process of distillation; "purify the water"
