What does REDUCE mean?

verb

1. cut down on; make a reduction in“reduce your daily fat intake”
2. make less complex“reduce a problem to a single question”
3. bring to humbler or weaker state or condition“He reduced the population to slavery”
4. simplify the form of a mathematical equation of expression by substituting one term for another
5. lower in grade or rank or force somebody into an undignified situation“She reduced her niece to a servant”
6. be the essential element“The proposal boils down to a compromise”
7. reduce in size; reduce physically“Hot water will shrink the sweater”
8. lessen and make more modest“reduce one's standard of living”