不及物動詞：
1. 落下，降落，跌落
2. 摔倒，跌倒
3.（價格、數(shù)量、水平等較大幅度地）下跌，下降，降低
可數(shù)名詞：
1. 下跌；跌落；跌倒
2.（數(shù)量、水平、價格等的）下降；降低；減少
3.（摔跤或柔道中的）壓倒，按倒
4.（雪、巖石等的）降落量
n.
1.[singular]【美】秋天，秋季
2.[singular] 垮臺，崩潰；滅亡
3.[singular]（國家、城市等的）陷落，淪陷；戰(zhàn)敗，敗亡
4.[plural] 瀑布 詞形變化

時態(tài) fell，fallen，falpng，falls

這兩個動詞都含有“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。

這些動詞都表示“落下，下降”之意。
descend通常指沿斜線或斜坡下降。
drop指物體從一定高度落下。
fall與drop同義，指突然或猛烈地降落，但fall也可指任何下落，同高度或形式無關(guān)。
sink指在空氣或水中垂直下降、下沉。

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 falpng

occur at a specified time or place

begin vigorously

pass suddenly and passively into a state of body or mind

come as if by falpng

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 decpne in strength or number or importance

fall for 愛上,迷戀;受…騙,上…當(dāng)

fall in with 偶然碰到；與…一致，符合，適合，贊同

in the fall 在秋季,在秋天

at the fall of 在…降臨時,在…陷落時

fall to 開始,進(jìn)入,落到

the fall 人類的墮落

fall in v.1.(房屋等)坍下，倒塌2.【軍】集合3.同意4.(債務(wù)等)到期

fall in for 得到,受到

on the fall 正在下降

fall into v.落入,陷于(混亂,錯誤等),注入,開始,分成,屬于

fall( )in 下沉

fall v.[I]1. 落下，降落，跌落2. 摔倒，跌倒3.（價格、數(shù)量、水平等較大幅度地）下跌，下降，降低n.[C]1. 下跌；跌落；跌倒2.（數(shù)量、水平、價格等的）下降；降低；減

fall in 進(jìn)入同步,坍方,一致

fall( )out 下降

fall off n. 減少, 跌落

fall flowering adj. 秋天開花的

cross fall 橫斜度

ice fall =icefall

rock fall 巖崩

fall back 【計】低效運(yùn)行