减少；缩小；使还原；使变弱
vi.减少；节食；蒸发；（液体）浓缩变稠
过去式：reduced过去分词：reduced现在分词：reducing第三人称单数：reduces
"reduce your daily fat intake"
同义词：cut downcut backtrimtrim downtrim backcutbring down
make less complex"reduce a problem to a single question"
bring to humbler or weaker state or condition"He reduced the population to slavery"
simplify the form of a mathematical equation of expression by substituting one term for anotherlower in grade or rank or force somebody into an undignified situation"She reduced her niece to a servant"
be the essential element同义词：come downboil down
reduce in size; reduce physically同义词：shrink
lessen and make more modest"reduce one's standard of living"
make smaller"reduce an image"
同义词：scale down
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同义词：deoxidizedeoxidise
narrow or limit"reduce the influx of foreigners"
同义词：tighten
put down by force or intimidation同义词：repressquashkeep downsubduesubjugate
undergo meiosis"The cells reduce"
reposition (a broken bone after surgery) back to its normal sitereduce in scope while retaining essential elements同义词：abridgeforeshortenabbreviateshortencutcontract
be cooked until very little liquid is left"The sauce should reduce to one cup"
同义词：boil downdecoctconcentrate
cook until very little liquid is left"The cook reduced the sauce by boiling it for a long time"
同义词：boil downconcentrate
lessen the strength or flavor of a solution or mixture同义词：dilutethinthin outcut
take off weight同义词：melt offlose weightslimslenderizethinslim down
reduce pollution降低污染
reduce weight整形美容减肥
reduce waste减少浪费
reduce by减少了
这组词都有“减少，减轻”的意思，其区别是：
diminishv.指因为不断消耗，在数量方面缓慢减少，也指在素质或者价值的下降。
The supply of oil has diminished because of the war.由于战争石油的供应减少了。
decline v. (数目、价格、比率)下降；谢绝，婉言推辞；衰退，衰落。
Last year, the crime rate in Chicago has sharply declined.去年芝加哥的犯罪率明显下降。
He declined our invitation to dinner.他婉拒了我们请他吃饭的邀请。
alleviatev.在痛苦方面的减轻，缓和
The painkiller alleviated the pain.止疼药减缓了疼痛。
decreasev.指数量上的减少；力量或者强度的减弱。
The population decreased a lot last year.去年人口数量急剧下降。
reducev.指人为地使某物在数量或重量方面的减少或降低。
He reduced the amount of money they could spend.他缩减了他们的开销。
diminish, decline, decrease, reduce这组词都有“减少”的意思，其区别是：
diminish v. (力量、势力)减弱，减少，强调由于某种原因而减少，这种减少可以造成能够为人们所察觉的后果或损失。
The need to take action has diminished.已经没有多少需要采取行动的必要性了。
decline v. (数量、数字、价格、比率)下降，下落。
Last year, the crime rate in Chicago has sharply declined.去年芝加哥的犯罪率明显下降。
decreasev.减少，减小，强调逐渐地下降或减少的过程。
reducev.是及物动词，指通过人为的方法在数量、规模、范围等方面减少，也可以指在地位、重要性方面降低等级。
He reduced his weight by 20 pounds by eating less and exercising.他通过节食和运动，体重减轻了20磅。
decrease, reducedecrease 多表示逐渐缩小。如：The swelling decreased daily.(肿胀日渐消退。)
reduce 为常用词，使用范围较大，可指尺寸，数量，规模和程度等，也可指地位，经济状况。如：He won’t reduce the rent of the house.(他不愿降低房租。)
induce, deduce, reduce这是一组形近易混词。
inducev.引诱，劝；引起，导致。
We couldn't induce the old lady to travel by air.我们无法劝说那位老太太坐飞机去。
deducev.推断，推理，演绎。
My friend becomes quiet when his girlfriend is angry with him; today he is quiet and so I deduce she is angry.我的朋友在他的女朋友生他的气的时候就会变得沉默，今天他很沉默，所以我推断她生气了。
reducev.减轻，减小；降低。
He reduced his weight by 20 pounds by eating less and exercising.他通过节食和运动，体重减轻了20磅。
diminish, dwindle, lessen, decrease, reduce这组词都有“减少，变少”的意思，其区别是：
diminish侧重大小数量和重要性的不断减小，强调减小的部分。
dwindle与decrease同义，指逐渐减小，但强调变得越来越少终至全无。
lessen普通用词，与decrease近义。指数目、程度、价值、实力等的减少。
decrease指逐渐地、不断地减少。
reduce普通用词，含义广。指数量、程度的降低或减少。