WordNet

establish as valid or genuine; "Can you back up your claims?" (同)back_up
strengthen by providing with a back or backing
a support that you can lean against while sitting; "the back of the dental chair was adjustable" (同)backrest
(American football) the position of a player on a football team who is stationed behind the line of scrimmage
the part of a garment that covers the back of your body; "they pinned a `kick me sign on his back"
travel backward; "back into the driveway"; "The car backed up and hit the tree"
the posterior part of a human (or animal) body from the neck to the end of the spine; "his back was nicely tanned" (同)dorsum
the 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" (同)rear
(football) a person who plays in the backfield
in or to or toward a past time; "set the clocks back an hour"; "never look back"; "lovers of the past looking fondly backward" (同)backward
at or to or toward the back or rear; "he moved back"; "tripped when he stepped backward"; "she looked rearward out the window of the car" (同)backward, backwards, rearward, rearwards
be behind; approve of; "He plumped for the Labor Party"; "I backed Kennedy in 1960" (同)endorse, indorse, plump for, plunk for, support
located at or near the back of an animal; "back (or hind) legs"; "the hinder part of a carcass" (同)hind, hinder
be in back of; "My garage backs their yard"
cause to travel backward; "back the car into the parking spot"
in or to or toward a former location; "she went back to her parents house"
in or to or toward an original condition; "he went back to sleep"
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"
in reply; "he wrote back three days later"
of an earlier date; "back issues of the magazine"
related to or located at the back; "the back yard"; "the back entrance"
shift to a counterclockwise direction; "the wind backed"
support financial backing for; "back this enterprise"
strengthen and support with rewards; "Lets reinforce good behavior" (同)reward
make stronger; "he reinforced the concrete" (同)reenforce
an accumulation caused by clogging or a stoppage; "a traffic backup on the main street"; "he discovered a backup in the toilet"
(computer science) a copy of a file or directory on a separate storage device; "he made a backup in case the original was accidentally damaged or erased" (同)computer backup

PrepTutorEJDIC

〈C〉(人・動物の)『背』,『背中』,背部 / 《通例the~》(正面に対して)(…の)『後ろ』,『裏』,奥,後部《+『of』+『名』》 / 《通例the back》背に似たもの;(手足の)甲;(刀の)みね;(いす・本の)背 / 〈C〉〈U〉(フットボール・ホッケーなどの)後衛 / 《名詞の前にのみ用にて》『後ろの』,後部にある,裏の / 後もどりする,逆の / 遅れている,未払いの / (中心から)遠い,へんぴな,奥地の / (音声が)後舌音の / 『後方へ』,『後ろに』(backward) / (場所・状態が)『もとへ』,帰って,返して / (時間的に)『さかのぼって』,今から…前に(ago) / 〈車など〉'を'『後退させる』 / (…で)〈人・計画など〉'を'『後援する』,支持する(support)《+『名』+『in』+『名』》 / (競馬で)…に賭ける / (…で)…‘の'伴奏をする《+『名』+『by』+『名』》 / …‘の'裏手にある,背景をなす / 〈手形など〉‘に'裏書きする(endorse) / 《しばしば受動態で》〈本〉‘に'背をつける,(…で)…'を'裏打ちする《+『名』+『with』+『名』》 / 後ずさりする,後退する(move backward)
…‘を'増強する,補強する / …‘に'増援する,援兵を送る