improve; make better
The prime minister said that he expected the new reforms to ameliorate the country's financial condition within about six months.
alleviate, ameliorate, assuage, palliate
Take the suffix 'rate'. With the increase in product rate it's quality will also improve. Ameli (Imli) improves the taste of food. Sounds a bit like deteriorate which means 'to lessen or degrade'. Here 'a' negates the meaning. Hence it means 'to better' In movie Amelie, Amelie tries to improve other's life.