reduce -- (make less complex; "reduce a problem to a single question")
reduce -- (bring to humbler or weaker state or condition; "He reduced the population to slavery")
reduce -- (simplify the form of a mathematical equation of expression by substituting one term for another)
reduce -- (lower in grade or rank or force somebody into an undignified situation; "She reduced her niece to a servant")
reduce, come down, boil down -- (be the essential element; "The proposal boils down to a compromise")
shrink, reduce -- (reduce in size; reduce physically; "Hot water will shrink the sweater"; "Can you shrink this image?")
reduce -- (lessen and make more modest; "reduce one's standard of living")
reduce, scale down -- (make smaller; "reduce an image")
deoxidize, deoxidise, reduce -- (to remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons)
reduce, tighten -- (narrow or limit; "reduce the influx of foreigners")
repress, quash, keep down, subdue, subjugate, reduce -- (put down by force or intimidation; "The government quashes any attempt of an uprising"; "China keeps down her dissidents very efficiently"; "The rich landowners subjugated the peasants working the land")
reduce -- (undergo meiosis; "The cells reduce")
reduce -- (reposition (a broken bone after surgery) back to its normal site)
reduce -- (destress and thus weaken a sound when pronouncing it)