fall behind

英：[fɔ:l biˈhaind]

美：[fɔl bɪˈhaɪnd]

verb

intransitive verb

to descend freely by the force of gravity

An apple fell from the tree.

to hang freely

her hair falls over her shoulders

to drop oneself to a lower position

fell to his knees

to come or go as if by falling

darkness falls early in the winter

to become born—usually used of lambs

to become lower in degree or level

the temperature fell 10°

to drop in pitch or volume

their voices fell to a whisper

issue sense 1a

wisdom that fell from his lips

to become lowered

her eyes fell

to leave an erect position suddenly and involuntarily

slipped and fell on the ice

to enter as if unawares : stumble, stray We fell into a trap.

fell into error

to drop down wounded or deadespecially: to die in battle

Many men fell on the battlefield.

to suffer military capture

after a long siege the city fell

to lose office

the party fell from power

to suffer ruin, defeat, or failure

the deal fell through

to commit an immoral actespecially: to lose one's chastity

but man willfully misused his God-given freedom and fell into sin—John Hick

to move or extend in a downward direction

the land falls away to the east

subside, abate

the wind is falling

to decline in quality, activity, or quantity

production fell off

to lose weight—used with off or away

The cattle have fallen off badly in the drought.

to assume a look of shame, disappointment, or dejection

his face fell

to decline in financial value or price

stocks fell sharply

to occur at a certain time

her birthday falls on a Monday this year

to come by chance

a job that fell into his hands

to come or pass by lot, assignment, or inheritance : devolve

it fell to him to break the news

to have a certain or proper position, place, or station

the accent falls on the second syllable

to come within the limits, scope, or jurisdiction of something

this word falls into the class of verbs

to pass suddenly and passively into a state of body or mind or a new state or condition fall in love

fall asleep

to set about heartily or actively

fell to work

strike, impinge

music falling on the ear

transitive verb

fell sense 1

noun

the act of falling by the force of gravity

a falling out, off, or away : dropping a fall of snow

the fall of leaves

the season when leaves fall from trees : autumn

a thing or quantity that falls or has fallenespecially: one or more meteorites or their fragments that have fallen together

a fall of rock at the base of the cliff

birth

a costume decoration of lace or thin fabric arranged to hang loosely and gracefully

a very wide turned-down collar worn in the 17th century

the part of a turnover collar from the crease to the outer edge

a wide front flap on trousers (such as those worn by sailors)

the freely hanging lower edge of the skirt of a coat

one of the three outer and often drooping segments of the flower of an iris compare standard sense 8b

long hair overhanging the face of dogs of some breeds

a usually long straight portion of hair that is attached to a person's own hair

a hoisting-tackle rope or chainespecially: the part of it to which the power is applied

loss of greatness : collapse

the fall of the Roman Empire

the surrender or capture of a besieged place

the fall of Troy

lapse or departure from innocence or goodness

loss of a woman's chastity

the blame for a failure or misdeed

took the fall for the robbery

the downward slope (as of a hill) : declivity

a precipitous descent of water : waterfall—usually used in plural but singular or plural in construction

a musical cadence

a falling-pitch intonation in speech

a decrease in size, quantity, degree, or value

the distance which something falls

inclination, pitch

the act of felling something

the quantity of trees cut down

an act of forcing a wrestler's shoulders to the mat for a specified time (such as one second)

Scotland destiny, lot

adjective

of, relating to, or suitable for autumn

a new fall coat

落后

Verb, Noun, and Adjective Middle English, from Old English feallan; akin to Old High German fallan to fall and perhaps to Lithuanian pulti

The first known use of fall was before the 12th century

as ofpreposition

on entry 1 sense 3, at as of the moment, things are fine

we begin work as of Tuesday

examplenoun

one that serves as a pattern to be followed or not followed a bad example

set a good example

punishment given to someone as a warning to others

the person so punished

we'll make an example of you

one of a group or collection that shows what the whole is like : sample

a fine example of the silversmith's art

a problem to be solved to show how a rule works

examples in arithmetic

steel woolnoun

a rough material composed of long fine steel shavings and used especially for cleaning and polishing

keep1 of 2verb

to be faithful to : fulfill

keep a promise

to act properly in relation to

keep the Sabbath

protect

keep us from harm

to take care of : tend

keep a garden

to continue doing something : maintain keep on working keep that up and you'll get into trouble

keep silence

to have in one's service or at one's disposal

keep a car

to preserve a record in

keep a diary

to have on hand regularly for sale

keep neckties

to continue to have in one's possession or power

kept the marbles I won

to prevent from leaving : detain was kept after school

keep a person in jail

to place for storage keep my socks in a drawer

keeps the catsup in the refrigerator

to hold back

keep a secret

to remain or cause to remain in a place, situation, or condition keep him waiting

keep off the grass

to continue in an unspoiled condition

food that keeps well

refrain entry 1

keep from talking

to take charge of (as a business) : manage

kept an inn

keep2 of 2noun

the strongest part of a castle in the Middle Ages

the necessities of life

earn one's keep

fall1 of 2verb

to come or go down freely by the force of gravity

to hang freely

hair falling over her shoulders

to drop oneself to a lower position

fell to their knees

to come as if by dropping down

night fell

to become of lower degree or level

the temperature fell 10°

to become lowered

his eyes fell

to topple from an upright position suddenly

slipped and fell on the ice

to enter blindly : stray

fell into a trap

to drop down wounded or dead

soldiers who have fallen in battle

to become captured or defeated

the fortress fell

to experience ruin or failure

our plans fell through

to fail to live up to a standard of conduct

to move or extend downward

the ground falls away to the east

to become less in amount or degree : diminish

the tide is falling

to become less in quality, activity, quantity, or value

prices fell

to take on a look of shame or low spirits

my face fell when I lost

to occur at a certain time

my birthday falls on a Tuesday

to come by chance

to pass (as a responsibility) from one person to another

it fell to us to break the news

to have the proper place or station

the accent falls on the second syllable

to come within the range of something

falls under her responsibilities

to pass from one condition of body or mind to another fall asleep

fall ill

to set about with enthusiasm or activity

fell to work

fall2 of 2noun

the act of falling by the force of gravity

a fall from a horse

a falling out, off, or away

the fall of the leaves

autumn sense 1

a thing or quantity that falls or has fallen

a heavy fall of snow

loss of greatness : collapse

the surrender or capture of a place under attack

departure from innocence or goodness

the downward slope of a hill

waterfall—usually used in plural

a decrease in size, quantity, degree, activity, or value

the distance which something falls

an act of forcing a wrestler's shoulders to the mat