(noun, adjective, verb, adverb)


1. related to or located at the back

- the back yard

- the back entrance

Similar word(s): posterior, backmost, hindermost, hindmost, rearmost, rear, rearward, aft

2. located at or near the back of an animal

- back (or hind) legs

Similar word(s): posterior, hind, hinder

3. of an earlier date

- back issues of the magazine

Similar word(s): noncurrent

Sentences with back as an adjective:

- Go in the back door of the house.

- I’d like to find a back issue of that magazine.

- They took a back road.

- back rent

- back action

- "U" in "rude" is a back vowel.


1. in or to or toward a former location

- she went back to her parents' house

2. at or to or toward the back or rear

- he moved back

- tripped when he stepped backward

Similar word(s): backward, backwards, rearward, rearwards

3. in or to or toward an original condition

- he went back to sleep

4. in or to or toward a past time

- set the clocks back an hour

- never look back

- lovers of the past looking fondly backward

Similar word(s): backward

5. in reply

- he wrote back three days later

6. in repayment or retaliation

- we paid back everything we had borrowed

- he hit me and I hit him back

- I was kept in after school for talking back to the teacher

Sentences with back as an adverb:

- He gave back the money.

- Sit all the way back in your chair.

- Step back from the curb.

- Fear held him back.

- If you hurt me, I'll hurt you back.


1. the posterior part of a human (or animal) body from the neck to the end of the spine

- his back was nicely tanned

Similar word(s): dorsum

Definition categories: body

2. the side that goes last or is not normally seen

- he wrote the date on the back of the photograph

Similar word(s): rear

Definition categories: man–made, side

3. the part of something that is furthest from the normal viewer

- he stood at the back of the stage

Similar word(s): rear

Definition categories: location, place, position

4. (football) a person who plays in the backfield

Definition categories: person, footballer

5. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord

- the fall broke his back

Similar word(s): backbone, rachis, spine

Definition categories: body

6. the protective covering on the front, back, and spine of a book

Similar word(s): binding, cover

Definition categories: man–made, protection

7. the part of a garment that covers the back of your body

- they pinned a `kick me' sign on his back

Definition categories: man–made

8. a support that you can lean against while sitting

- the back of the dental chair was adjustable

Similar word(s): backrest

Definition categories: man–made, support

9. (American football) the position of a player on a football team who is stationed behind the line of scrimmage

Definition categories: act, position

Sentences with back as a noun:

- Could you please scratch my back?

- I hurt my back lifting those crates.

- I still need to finish the back of your dress.

- Can you fix the back of this chair?

- He sat in the back of the room.

- Turn the book over and look at the back.

- The titles are printed on the backs of the books.

- Tap it with the back of your knife.

- I hung the clothes on the back of the door.

- We'll meet out in the back of the library.

- The car was near the back of the train.

- The backs were lined up in an I formation.

- The small boat raced over the backs of the waves.

- The ship's back broke in the pounding surf.

- Put some back into it!

- Could I get a martini with a water back?


1. be behind; approve of

- I backed Kennedy in 1960

Similar word(s): endorse, indorse, support

Definition categories: social, approve, okay, sanction

2. travel backward

- back into the driveway

- The car backed up and hit the tree

Definition categories: motion, go, locomote, move, travel

3. give support or one's approval to

- I can't back this plan

Similar word(s): endorse, indorse, second

Definition categories: social, support

4. cause to travel backward

- back the car into the parking spot

Definition categories: motion

5. support financial backing for

- back this enterprise

Definition categories: possession, finance

6. be in back of

- My garage backs their yard

Definition categories: stative, lie

7. place a bet on

- Which horse are you backing?

Similar word(s): gage, game, punt, stake

Definition categories: competition, bet, play, wager

8. shift to a counterclockwise direction

- the wind backed

Definition categories: change, shift, switch

9. establish as valid or genuine

- Can you back up your claims?

Definition categories: change, affirm, confirm, corroborate, substantiate, support, sustain

10. strengthen by providing with a back or backing

Definition categories: change, strengthen

Sentences with back as a verb:

- the train backed into the station;  the horse refuses to back

- I back you all the way;  which horse are you backing in this race?

- to back oxen

- The mugger backed her into a corner and demanded her wallet.

- to back books

- to back a letter;  to back a note or legal document

- to back the oars