不及物动词：
1. 落下，降落，跌落
2. 摔倒，跌倒
3.（价格、数量、水平等较大幅度地）下跌，下降，降低
可数名词：
1. 下跌；跌落；跌倒
2.（数量、水平、价格等的）下降；降低；减少
3.（摔跤或柔道中的）压倒，按倒
4.（雪、岩石等的）降落量
n.
1.[singular]【美】秋天，秋季
2.[singular] 垮台，崩溃；灭亡
3.[singular]（国家、城市等的）陷落，沦陷；战败，败亡
4.[plural] 瀑布
touch or seem as if touching visually or audibly
to be given by assignment or distribution
fall to somebody by assignment or lot
move in a specified direction
be inherited by
fall or flow in a certain way
decrease in size, extent, or range
a downward slope or bend
the time of day immediately following sunset
a sudden sharp decrease in some quantity
the act of surrendering (under agreed conditions)
come under, be classified or included
fall from clouds
die, as in battle or in a hunt
be due
suffer defeat, failure, or ruin
yield to temptation or sin
lose one's chastity
to be given by right or inheritance
lose office or power
come into the possession of
be captured
slope downward
descend in free fall under the influence of gravity
drop oneself to a lower or less erect position
lose an upright position suddenly
assume a disappointed or sad expression
be born, used chiefly of lambs
come out; issue
be cast down
go as if by falling
occur at a specified time or place
begin vigorously
pass suddenly and passively into a state of body or mind
come as if by falling
the season when the leaves fall from the trees
when a wrestler's shoulders are forced to the mat
the lapse of mankind into sinfulness because of the sin of Adam and Eve
a free and rapid descent by the force of gravity
a movement downward
a sudden drop from an upright position
a lapse into sin; a loss of innocence or of chastity
move downward and lower, but not necessarily all the way
a sudden decline in strength or number or importance
fall for 爱上,迷恋;受…骗,上…当
fall in with 偶然碰到；与…一致，符合，适合，赞同
in the fall 在秋季,在秋天
at the fall of 在…降临时,在…陷落时
fall to 开始,进入,落到
the fall 人类的堕落
fall in v.1.(房屋等)坍下，倒塌2.【军】集合3.同意4.(债务等)到期
fall in for 得到,受到
on the fall 正在下降
fall into v.落入,陷于(混乱,错误等),注入,开始,分成,属于
fall( )in 下沉
fall v.[I]1. 落下，降落，跌落2. 摔倒，跌倒3.（价格、数量、水平等较大幅度地）下跌，下降，降低n.[C]1. 下跌；跌落；跌倒2.（数量、水平、价格等的）下降；降低；减
fall in 进入同步,坍方,一致
fall( )out 下降
fall off n. 减少, 跌落
fall flowering adj. 秋天开花的
cross fall 横斜度
ice fall =icefall
rock fall 岩崩
fall back 【计】低效运行
这两个动词都含有“倒塌”之意。
collapse 通常指房屋等突然倒塌。
fall 一般指由于失去平衡等原因而倒塌，也可作引申用。
这些动词都表示“落下，下降”之意。
descend 通常指沿斜线或斜坡下降。
drop 指物体从一定高度落下。
fall 与drop 同义，指突然或猛烈地降落，但fall 也可指任何下落，同高度或形式无关。
sink 指在空气或水中垂直下降、下沉。
