fall in 到期；集合；排隊；倒塌；與某人在一起
fall in love 墜入愛河；愛上某人
fall into 落入；分成
fall in love with 愛上
fall of 墜落
fall down 跌倒；失??；倒塌
in the fall 在秋天
rise and fall 漲落；抑揚
fall off 減少；跌落；下降；離開；衰退
fall on 落到；指向
fall from 從…落下
fall behind 拖欠；落在后面
free fall 自由下落
fall back 退卻,后退；[計]回落
fall ill 生病
fall for something 相信某事
fall for 迷戀；信以為真
fall back on 退到；求助于；回頭再說
fall out 發(fā)生；脫落；爭吵；離隊；結(jié)果是
fall under 受到（影響等）；被歸入
fall down
1.掉下,落下,跌倒：
The old lady fell down in the street and broke her leg.
老婦跌倒在大街上,摔壞了腿.
2.拜倒,跪倒：
They fell down before him.
他們拜倒在他面前.
3.倒塌：
The old house soon fell down.
這座老房很快就倒塌了.
4.毫無結(jié)果,(在…方面)失敗(常與on,in連用)；被表明為不正確、不足或不妥；證明是不令人滿意的(或不切合實際)：
Your plan fell down when it proved too costly.
你的計劃是不切合實際的,因為它被證實耗資太大.
5.漂流而下
fall off
1.減少,縮小；變輕；降低,減退：
Orders have been falling off lately;we must advertise more.
近來訂貨減少,我們必須加大廣告力度.
Interest in the game has fallen off.
人們對這項運動的興趣已經(jīng)降低.
2.(質(zhì)量)下降,變壞；變瘦,(健康、精力等的)衰退：
The quality of these goods has fallen off since last year.
去年以來,這些貨物的質(zhì)量開始下降.
3.【航海學(xué)】(船)偏離航線,改變航向,背著風(fēng),轉(zhuǎn)向下風(fēng)處：
The leading boat fell off when the wind grew too strong.
風(fēng)吹得太猛時,領(lǐng)頭的船轉(zhuǎn)向了下風(fēng).
4.從…落下,(從…)跌落(或下降)；落下；跌落：
When you are learning to ride a bicycle,you often fall off.
在你學(xué)騎自行車時,你常常會從車上摔下來.
5.離開,(朋友等)漸漸疏遠(yuǎn)；脫離,退出；背棄,背叛：
Some of their most loyal members have now fallen off.
他們一些最忠誠的會員現(xiàn)已經(jīng)退出了.
His friends fell off one by one when he was in adversity.
在他身處逆境時,他的朋友一個接一個離他而去.
6.(逐漸)消失,消亡,死亡,廢棄：
That custom has fallen off.
那個風(fēng)俗已經(jīng)廢棄了.
7.(動物)失去對…的食欲：
His horse is falling off its hey.
他那匹馬對干草沒有胃口.
8.【軍事】(飛機(jī))側(cè)降