back
noun
the posterior part of a human (or animal) body from the neck to the end of the spine
“his back was nicely tanned”
Synonymsdorsumthe side that goes last or is not normally seen
“he wrote the date on the back of the photograph”
Synonymsrearthe part of something that is furthest from the normal viewer
“he stood at the back of the stage”
“it was hidden in the rear of the store”
SynonymsrearOppositesfront(football) a person who plays in the backfield
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
“the fall broke his back”
the protective covering on the front, back, and spine of a book
“the book had a leather binding”
the part of a garment that covers the back of your body
“they pinned a `kick me' sign on his back”
a support that you can lean against while sitting
“the back of the dental chair was adjustable”
Synonymsbackrest(American football) the position of a player on a football team who is stationed behind the line of scrimmage
verb
be behind; approve of
“He plumped for the Labor Party”
“I backed Kennedy in 1960”
travel backward
“back into the driveway”
“The car backed up and hit the tree”
give support or one's approval to
“I'll second that motion”
“I can't back this plan”
cause to travel backward
“back the car into the parking spot”
Oppositesadvancesupport financial backing for
“back this enterprise”
be in back of
“My garage backs their yard”
Oppositesfrontplace a bet on
“Which horse are you backing?”
“I'm betting on the new horse”
shift to a counterclockwise direction
“the wind backed”
Oppositesveerestablish as valid or genuine
“Can you back up your claims?”
Synonymsback upstrengthen by providing with a back or backing
adjective
related to or located at the back
“the back yard”
“the back entrance”
Oppositesfrontlocated at or near the back of an animal
“back (or hind) legs”
“the hinder part of a carcass”
of an earlier date
“back issues of the magazine”
adverb
in or to or toward a former location
“she went back to her parents' house”
at or to or toward the back or rear
“he moved back”
“tripped when he stepped backward”
in or to or toward an original condition
“he went back to sleep”
in or to or toward a past time
“set the clocks back an hour”
“never look back”
SynonymsbackwardOppositesaheadin reply
“he wrote back three days later”
in repayment or retaliation
“we paid back everything we had borrowed”
“he hit me and I hit him back”
Source: WordNet 3.1, Princeton University