Back then

ˈbak

那时候

当时

noun

the rear part of the human body especially from the neck to the end of the spine

They were left with nothing but the clothes on their backs.

the part of a lower animal (such as a quadruped) corresponding to the human back

riding on the back of an elephant

spinal column

She had surgery on her back.

spine sense 1c

The title is on the book's back.

the side or surface opposite the front or face : the rear partthe back of the head the back of the mirroralso: the farther or reverse side wrote the number on the back of an envelope

I only saw him from the back.

something at or on the back for support

back of a chair

a place away from the front

sat in back

a position in some games (such as football or soccer) behind the front line of playersalso: a player in this position

a defensive back

informal a swimming race in which swimmers use the backstroke

She placed first in the 100-meter back.

noun

the rear part of the human body especially from the neck to the end of the spine

They were left with nothing but the clothes on their backs.

the part of a lower animal (such as a quadruped) corresponding to the human back

riding on the back of an elephant

spinal column

She had surgery on her back.

spine sense 1c

The title is on the book's back.

the side or surface opposite the front or face : the rear partthe back of the head the back of the mirroralso: the farther or reverse side wrote the number on the back of an envelope

I only saw him from the back.

something at or on the back for support

back of a chair

a place away from the front

sat in back

a position in some games (such as football or soccer) behind the front line of playersalso: a player in this position

a defensive back

informal a swimming race in which swimmers use the backstroke

She placed first in the 100-meter back.

adverb

to, toward, or at the rear

asked the crowd to move back

in or into the past : backward in time an event back in the last century Back then, no one had ever heard of chronic fatigue syndrome.also: ago several years back met him in the street two days back

looking back on her youth

to or at an angle off the vertical

leaned back on his chair

under restraint holding back a laugh

He wanted to fight but his friends held him back.

in an inferior or secondary positionespecially: behind a competitor in points or ranking

finished three strokes back

to, toward, or in a place from which a person or thing came put the book back

She left home and never went back.

to or toward a former state

went back to private life

in return or reply

forgot to write back

adverb

to, toward, or at the rear

asked the crowd to move back

in or into the past : backward in time an event back in the last century Back then, no one had ever heard of chronic fatigue syndrome.also: ago several years back met him in the street two days back

looking back on her youth

to or at an angle off the vertical

leaned back on his chair

under restraint holding back a laugh

He wanted to fight but his friends held him back.

in an inferior or secondary positionespecially: behind a competitor in points or ranking

finished three strokes back

to, toward, or in a place from which a person or thing came put the book back

She left home and never went back.

to or toward a former state

went back to private life

in return or reply

forgot to write back

adjective

being at or in the back

back door

distant from a central or main area

back roads

of a speech sound articulated at or toward the back of the oral passage : formed deep within the mouth

back vowels

having returned or been returned

being in arrears : overdue

is owed several months in back pay

moving or operating backward : reverse

back action with oars

not current

back issues of a magazine

golf constituting the final 9 holes of an 18-hole course

adjective

being at or in the back

back door

distant from a central or main area

back roads

of a speech sound articulated at or toward the back of the oral passage : formed deep within the mouth

back vowels

having returned or been returned

being in arrears : overdue

is owed several months in back pay

moving or operating backward : reverse

back action with oars

not current

back issues of a magazine

golf constituting the final 9 holes of an 18-hole course

verb

transitive verb

to support by material or moral assistance—often used with upback up a friend in a fight

backing a candidate for governor

substantiate—often used with up

needs to back up her argument with evidence

to assume financial responsibility for

back a new company

to provide musical accompaniment for—often used with up

a singer backed up by a guitarist

to cause to go back (see back entry 2 sense 1a) or in reverse

back the car into the garage

to articulate (a speech sound) with the tongue farther back : to form deeper within the mouth

to furnish with a rear part : to furnish with a back (see back entry 1 sense 2)

back a skirt with stiff material

to be at the rear part of : to be at the back (see back entry 1 sense 2) of

a row of garages back the building

intransitive verb

to move backward—often used with upback up to give him some spaceLet's back up a little to clarify what we're saying.

backed into a parking space

of the wind to shift counterclockwise compare veer entry 1 sense 2

to have the rear part facing in the direction of something

The house backs onto a golf course.

verb

transitive verb

to support by material or moral assistance—often used with upback up a friend in a fight

backing a candidate for governor

substantiate—often used with up

needs to back up her argument with evidence

to assume financial responsibility for

back a new company

to provide musical accompaniment for—often used with up

a singer backed up by a guitarist

to cause to go back (see back entry 2 sense 1a) or in reverse

back the car into the garage

to articulate (a speech sound) with the tongue farther back : to form deeper within the mouth

to furnish with a rear part : to furnish with a back (see back entry 1 sense 2)

back a skirt with stiff material

to be at the rear part of : to be at the back (see back entry 1 sense 2) of

a row of garages back the building

intransitive verb

to move backward—often used with upback up to give him some spaceLet's back up a little to clarify what we're saying.

backed into a parking space

of the wind to shift counterclockwise compare veer entry 1 sense 2

to have the rear part facing in the direction of something

The house backs onto a golf course.

Noun Middle English, from Old English bæc; akin to Old High German bah back, Old Norse bak Adverb Middle English bac, aphetic form of abak aback Adjective Middle English, partly attributive use of bac, back back >entry 1, partly derivative of back back >entry 2 Verb verbal derivative of back >entry 1

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

back1 of 4noun

the rear part of the human body especially from the neck to the end of the spine

the corresponding part of a four-footed or lower animal

the part of something that is opposite or away from the front part

something at or on the back for support

back of a chair

a position in some games (as football or soccer) behind the front line of players

a player in this position

back2 of 4adverb

to, toward, or at the rear

in or into the past : ago

in or into a reclining position

under control : in check

held back

to, toward, or in a place from which a person or thing came

in return or reply talk back

write back

back3 of 4adjective

being at or in the back

back door

distant from a central or main area

back roads

not yet paid : overdue

back rent

no longer current

back issues of a magazine

back4 of 4verb

to give aid or support to

to move or cause to move back or backward

to shift in a counterclockwise direction

the wind backed around

to provide with a back