part of speech: noun

definition 1: the part of the body of a human or animal that is on the opposite side from the chest and between the neck and hips.

definition 2: the backbone; spine.

  • Straighten your back!

synonyms: backbone, spinal column, spine

definition 3: the opposite side from the front.

  • She found the blanket in the back of the car.
  • Put your name on the back of this paper.

synonyms: rear, reverse

antonyms: face, front

phrase: behind one’s back

phrase: turn one’s back on


part of speech: verb

inflections: backs, backing, backed

definition 1: to cause to move backward.

  • He backed the car into the garage.

synonyms: reverse

antonyms: advance

definition 2: to give support to; commit to helping.

  • The governor hopes the President will back him in the next election.

synonyms: endorse

antonyms: oppose

phrase: back out of


part of speech: adjective

definition 1: in the rear part; behind the front part.

  • The children rode in the back seat of the car.

synonyms: rear

antonyms: front

definition 2: old; from the past.

  • The library had the back issues of the newspaper I needed for my report.

antonyms: future

phrase: back and forth

part of speech: adverb

definition 1: toward the direction that is opposite from forward; backward; away.

  • The elephant moved back from the edge of the cliff.

definition 2: to an earlier time or a place where one was before.

  • Think back to your childhood.
  • He went back home.

definition 3: in return or in reply.

  • Joe hit Bob, and Bob hit back.
  • I didn’t call back.

derivation: backless (adj.)