reduce

cut down on; make a reduction in

“reduce your daily fat intake”

narrow or limit

“reduce the influx of foreigners”

cook until very little liquid is left

“The cook reduced the sauce by boiling it for a long time”

reduce in size; reduce physically

bring to humbler or weaker state or condition

“He reduced the population to slavery”

destress and thus weaken a sound when pronouncing it

lessen and make more modest

“reduce one's standard of living”

lower in grade or rank or force somebody into an undignified situation

“She reduced her niece to a servant”

make less complex

“reduce a problem to a single question”

reposition (a broken bone after surgery) back to its normal site

simplify the form of a mathematical equation of expression by substituting one term for another