back - definition and synonyms


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present tense
present participlebacking
past tensebacked
past participlebacked
  1. 1
    [transitive] to give support to a person, organization, or plan, making them more likely to succeed

    Both main parties are backing these proposals.

    back someone on something:

    We’ll back you all the way on this one!

    1. a.
      [usually passive] to make an order or request more effective by threatening to do something if people do not do what you want

      Schools need to have clear rules on bullying, backed by a system of punishments.

  2. 2
    [intransitive/transitive] to move backwards, or to make someone move backwards
    back into/onto/out of etc:

    She backed out of the room carrying a tray.

    He backed me into a corner at the party.

    1. a.
      to make a car move backwards

      Could you just back onto the driveway?

  3. 3
    [transitive] to bet (=risk money) that a particular person or animal will win a race or competition

    I’m backing France to win the championship.

     Synonyms and related words
  4. 4
    [transitive] [always passive] if a place is backed by something, it has something at the back of it or directly behind it
  5. 5
    [transitive] [often passive] music to play or sing the music that goes with the main singer or musician’s performance

    Manilow was backed by a full orchestra.

See also